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Vesel A, Kolar M, Doliska A, Stana-Kleinschek K, Mozetic M. Etching of polyethylene terephthalate thin films by neutral oxygen atoms in the late flowing afterglow of oxygen plasma. SURF INTERFACE ANAL 2012. [DOI: 10.1002/sia.5064] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Alenka Vesel
- Plasma laboratory; Institute Jozef Stefan; Jamova 39 Ljubljana Slovenia
| | - Metod Kolar
- Jozef Stefan International Postgraduate School; Jamova 39 Ljubljana Slovenia
| | - Ales Doliska
- Laboratory for Characterization and Processing of Polymers, Faculty of Mechanical Engineering; University of Maribor; Smetanova 17 SI-2000 Maribor Slovenia
| | - Karin Stana-Kleinschek
- Laboratory for Characterization and Processing of Polymers, Faculty of Mechanical Engineering; University of Maribor; Smetanova 17 SI-2000 Maribor Slovenia
| | - Miran Mozetic
- Plasma laboratory; Institute Jozef Stefan; Jamova 39 Ljubljana Slovenia
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Chvátalová L, Čermák R, Mráček A, Grulich O, Vesel A, Ponížil P, Minařík A, Cvelbar U, Beníček L, Sajdl P. The effect of plasma treatment on structure and properties of poly(1-butene) surface. Eur Polym J 2012. [DOI: 10.1016/j.eurpolymj.2012.02.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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53
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Popelka A, Novák I, Lehocký M, Chodák I, Sedliačik J, Gajtanska M, Sedliačiková M, Vesel A, Junkar I, Kleinová A, Špírková M, Bílek F. Anti-bacterial treatment of polyethylene by cold plasma for medical purposes. Molecules 2012; 17:762-85. [PMID: 22245943 PMCID: PMC6268539 DOI: 10.3390/molecules17010762] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2011] [Revised: 01/09/2012] [Accepted: 01/10/2012] [Indexed: 11/16/2022] Open
Abstract
Polyethylene (PE) is one of the most widely used polymers in many industrial applications. Biomedical uses seem to be attractive, with increasing interest. However, PE it prone to infections and its additional surface treatment is indispensable. An increase in resistance to infections can be achieved by treating PE surfaces with substances containing antibacterial groups such as triclosan (5-Chloro-2-(2,4-dichlorophenoxy)phenol) and chlorhexidine (1,1'-Hexamethylenebis[5-(4-chlorophenyl)biguanide]). This work has examined the impact of selected antibacterial substances immobilized on low-density polyethylene (LDPE) via polyacrylic acid (PAA) grafted on LDPE by low-temperature barrier discharge plasma. This LDPE surface treatment led to inhibition of Escherichia coli and Staphylococcus aureus adhesion; the first causes intestinal disease, peritonitis, mastitis, pneumonia, septicemia, the latter is the reason for wound and urinary tract infections.
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Affiliation(s)
- Anton Popelka
- Polymer Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 845 41 Bratislava 45, Slovakia
| | - Igor Novák
- Polymer Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 845 41 Bratislava 45, Slovakia
- Author to whom correspondence should be addressed; ; Tel.: +421-903-925-725
| | - Marián Lehocký
- Centre of Polymer Systems, University Institute, Tomas Bata University in Zlín, Nad Ovčírnou 3685, 760 01 Zlín, Czech Republic
| | - Ivan Chodák
- Polymer Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 845 41 Bratislava 45, Slovakia
| | - Ján Sedliačik
- Faculty of Wood Sciences and Technology, Technical University in Zvolen, T.G. Masaryka 2117/24, 960 53 Zvolen, Slovakia
| | - Milada Gajtanska
- Faculty of Wood Sciences and Technology, Technical University in Zvolen, T.G. Masaryka 2117/24, 960 53 Zvolen, Slovakia
| | - Mariana Sedliačiková
- Faculty of Wood Sciences and Technology, Technical University in Zvolen, T.G. Masaryka 2117/24, 960 53 Zvolen, Slovakia
| | - Alenka Vesel
- Plasma Laboratory, Department of Surface Engineering, Jožef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana, Slovenia
| | - Ita Junkar
- Plasma Laboratory, Department of Surface Engineering, Jožef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana, Slovenia
| | - Angela Kleinová
- Polymer Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 845 41 Bratislava 45, Slovakia
| | - Milena Špírková
- Institute of Macromolecular Chemistry AS CR, v. v. i, Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic
| | - František Bílek
- Polymer Centre, Faculty of Technology, Tomas Bata University in Zlín, T.G.M Sq. 275, 762 72 Zlín, Czech Republic
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Eleršič K, Pavlič JI, Iglič A, Vesel A, Mozetič M. Electric-field controlled liposome formation with embedded superparamagnetic iron oxide nanoparticles. Chem Phys Lipids 2012; 165:120-4. [DOI: 10.1016/j.chemphyslip.2011.11.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2011] [Revised: 11/10/2011] [Accepted: 11/11/2011] [Indexed: 10/15/2022]
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55
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Sedlacik M, Pavlinek V, Lehocky M, Mracek A, Grulich O, Svrcinova P, Filip P, Vesel A. Plasma-treated carbonyl iron particles as a dispersed phase in magnetorheological fluids. Colloids Surf A Physicochem Eng Asp 2011. [DOI: 10.1016/j.colsurfa.2011.07.035] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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56
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Vrlinic T, Debarnot D, Mozetic M, Vesel A, Kovac J, Coudreuse A, Legeay G, Poncin-Epaillard F. Elaboration of nano-structured grafted polymeric surface. J Colloid Interface Sci 2011; 362:300-10. [PMID: 21784430 DOI: 10.1016/j.jcis.2011.06.057] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2011] [Revised: 06/14/2011] [Accepted: 06/23/2011] [Indexed: 11/18/2022]
Abstract
The surface grafting of multi-polymeric materials can be achieved by grafting as components such as polymers poly(N-isopropylacrylamide) and/or surfactant molecules (hexatrimethylammonium bromide, polyoxyethylene sorbitan monolaurate). The chosen grafting techniques, i.e. plasma activation followed by coating, allow a large spectrum of functional groups that can be inserted on the surface controlling the surface properties like adhesion, wettability and biocompatibility. The grafted polypropylene surfaces were characterized by contact angle analyses, XPS and AFM analyses. The influence of He plasma activation, of the coating parameters such as concentrations of the various reactive agents are discussed in terms of hydrophilic character, chemical composition and morphologic surface heterogeneity. The plasma pre-activation was shown inevitable for a permanent polymeric grafting. PNIPAM was grafted alone or with a mixture of the surfactant molecules. Depending on the individual proportion of each component, the grafted surfaces are shown homogeneous or composed of small domains of one component leading to a nano-structuration of the grafted surface.
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Affiliation(s)
- Tjasa Vrlinic
- LUNAM Université, Laboratoire Polymères, Colloïdes et Interfaces, UMR CNRS 6120 - Université du Maine, av. O. Messiaen, 72085 Le Mans, France
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Doliška A, Vesel A, Kolar M, Stana-Kleinschek K, Mozetič M. Interaction between model poly(ethylene terephthalate) thin films and weakly ionised oxygen plasma. SURF INTERFACE ANAL 2011. [DOI: 10.1002/sia.3769] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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58
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Mohan T, Kargl R, Doliška A, Vesel A, Köstler S, Ribitsch V, Stana-Kleinschek K. Wettability and surface composition of partly and fully regenerated cellulose thin films from trimethylsilyl cellulose. J Colloid Interface Sci 2011; 358:604-10. [PMID: 21458821 DOI: 10.1016/j.jcis.2011.03.022] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2010] [Revised: 02/02/2011] [Accepted: 03/06/2011] [Indexed: 11/28/2022]
Abstract
The wettability and surface free energy (SFE) of partly and fully regenerated cellulose model surfaces from spin coated trimethylsilyl cellulose were determined by static contact angle (SCA) measurements. In order to gain detailed insight into the desilylation reaction of the surfaces the results from SCA measurements were compared with data from other surface analytical methods, namely thickness measurements, X-ray photoelectron spectroscopy (XPS) and attenuated total reflectance infrared spectroscopy (ATR-IR). Additionally, the influence of ultra high vacuum treatment (UHV) during XPS measurements on the water wettability and surface morphology of regenerated cellulose thin films was investigated. The wetting of polar and non-polar liquids increased with prolonged regeneration time, which is reflected in the higher SFE values and polarities of the films. After UHV treatment the water SCA of partly regenerated films decreases, whereas fully regenerated cellulose shows a higher water SCA. Therefore it is assumed that volatile desilylation products tend to adsorb on partly regenerated films, which strongly influences their wettability.
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Affiliation(s)
- Tamilselvan Mohan
- Laboratory for Characterization and Processing of Polymers, Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, SI-2000 Maribor, Slovenia
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Merchan M, Sedlarikova J, Vesel A, Sedlarik V, Pastorek M, Sáha P. Characterization of Antibacterial, Mechanical, and Structural Properties of Polyvinyl Chloride/Silver Nitrate Composites Prepared by Thermoplastic Compounding. International Journal of Polymer Analysis and Characterization 2010. [DOI: 10.1080/1023666x.2010.500534] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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60
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Asadinezhad A, Novák I, Lehocký M, Bílek F, Vesel A, Junkar I, Sáha P, Popelka A. Polysaccharides coatings on medical-grade PVC: a probe into surface characteristics and the extent of bacterial adhesion. Molecules 2010; 15:1007-27. [PMID: 20335959 PMCID: PMC6263189 DOI: 10.3390/molecules15021007] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2010] [Revised: 02/22/2010] [Accepted: 02/23/2010] [Indexed: 11/16/2022] Open
Abstract
Medical-grade polyvinyl chloride was coated by polysaccharides through a novel physicochemical approach. An initial surface activation was performed foremost via diffuse coplanar surface barrier discharge plasma in air at ambient temperature and pressure. Then, radical graft copolymerization of acrylic acid through grafting-from pathway was directed to render a well-defined brush of high density, and finally a chitosan monolayer and chitosan/pectin alternating multilayer were bound onto the functionalized surfaces. Surface characteristics were systematically investigated using several probe techniques. In vitro bacterial adhesion and biofilm formation assays indicated that a single chitosan layer was incapable of hindering the adhesion of a Staphylococcus aureus bacterial strain, while up to 30% reduction was achieved by the chitosan/pectin layered assembly. On the other hand, chitosan and chitosan/pectin multilayer could retard Escherichia coli adhesion by 50% and 20%, respectively. Furthermore, plasma treated and graft copolymerized samples were also found effective to diminish the degree of adherence of Escherichia coli.
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Affiliation(s)
- Ahmad Asadinezhad
- Polymer Centre, Faculty of Technology, Tomas Bata University in Zlín, T.G.M Sq. 275, 762 72 Zlín, Czech Republic
| | - Igor Novák
- Polymer Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 842 36 Bratislava, Slovakia
| | - Marián Lehocký
- Tomas Bata University in Zlín, T.G.M. Sq. 5555, 760 01 Zlín, Czech Republic
- Author to whom correspondence should be addressed: ; Tel.: +420 608616048; Fax: +420 576031444
| | - František Bílek
- Polymer Centre, Faculty of Technology, Tomas Bata University in Zlín, T.G.M Sq. 275, 762 72 Zlín, Czech Republic
| | - Alenka Vesel
- Plasma Laboratory, Department of Surface Engineering, Jožef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana, Slovenia
| | - Ita Junkar
- Plasma Laboratory, Department of Surface Engineering, Jožef Stefan Institute, Jamova cesta 39, SI-1000 Ljubljana, Slovenia
| | - Petr Sáha
- Polymer Centre, Faculty of Technology, Tomas Bata University in Zlín, T.G.M Sq. 275, 762 72 Zlín, Czech Republic
| | - Anton Popelka
- Polymer Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 842 36 Bratislava, Slovakia
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Asadinezhad A, Novák I, Lehocký M, Sedlarík V, Vesel A, Junkar I, Sáha P, Chodák I. An in vitro bacterial adhesion assessment of surface-modified medical-grade PVC. Colloids Surf B Biointerfaces 2010; 77:246-56. [PMID: 20189783 DOI: 10.1016/j.colsurfb.2010.02.006] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2010] [Revised: 02/03/2010] [Accepted: 02/03/2010] [Indexed: 02/01/2023]
Abstract
Medical-grade polyvinyl chloride was surface modified by a multistep physicochemical approach to improve bacterial adhesion prevention properties. This was fulfilled via surface activation by diffuse coplanar surface barrier discharge plasma followed by radical graft copolymerization of acrylic acid through surface-initiated pathway to render a structured high density brush. Three known antibacterial agents, bronopol, benzalkonium chloride, and chlorhexidine, were then individually coated onto functionalized surface to induce biological properties. Various modern surface probe techniques were employed to explore the effects of the modification steps. In vitro bacterial adhesion and biofilm formation assay was performed. Escherichia coli strain was found to be more susceptible to modifications rather than Staphylococcus aureus as up to 85% reduction in adherence degree of the former was observed upon treating with above antibacterial agents, while only chlorhexidine could retard the adhesion of the latter by 50%. Also, plasma treated and graft copolymerized samples were remarkably effective to diminish the adherence of E. coli.
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Affiliation(s)
- Ahmad Asadinezhad
- Polymer Centre, Faculty of Technology, Tomas Bata University in Zlín, T.G.M. Sq. 275, 762 72 Zlín, Czech Republic
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Vesel A, Drenik A, Zaplotnik R, Mozetic M, Balat-Pichelin M. Reduction of thin oxide films on tungsten substrate with highly reactive cold hydrogen plasma. SURF INTERFACE ANAL 2010. [DOI: 10.1002/sia.3185] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Sowe M, Novák I, Vesel A, Junkar I, Lehocký M, Sáha P, Chodák I. Analysis and Characterization of Printed Plasma-Treated Polyvinyl Chloride. International Journal of Polymer Analysis and Characterization 2009. [DOI: 10.1080/10236660903225494] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Vesel A, Junkar I, Cvelbar U, Kovac J, Mozetic M. Surface modification of polyester by oxygen- and nitrogen-plasma treatment. SURF INTERFACE ANAL 2008. [DOI: 10.1002/sia.2923] [Citation(s) in RCA: 220] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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66
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67
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68
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Vrlinič T, Vesel A, Cvelbar U, Krajnc M, Mozetič M. Rapid surface functionalization of poly(ethersulphone) foils using a highly reactive oxygen-plasma treatment. SURF INTERFACE ANAL 2007. [DOI: 10.1002/sia.2548] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Trdan S, Vidrih M, Vesel A, Bobnar A. Research on the influence of red deer (Cervus elaphus L.) grazing on grassland production in the south-eastern part of Slovenia. Commun Agric Appl Biol Sci 2003; 68:313-20. [PMID: 15149125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
Almost 60% of Slovenian territory is covered by forests and only Finland and Sweden are known as the more forest abundant countries in Europe. Among game that intensifies difficulties in the field of agricultural production, especially in north-eastern and south-eastern parts of the country, roe deer (Capreolus capreolus L.), wild boar (Sus scrofa L.) and red deer (Cervus elaphus L.) prevail. Negative impact of game on agricultural production in the above mentioned parts of Slovenia has risen significantly in the last decade. The data about the population density of game in Slovenia is often based on the payments of their damage on the cultivated plants that are usually performed by the hunting societies. Grassland represents around 60% of agricultural land in Slovenia, and herbage is a very important component of the red deer diet. At the forest border where ruminant ungulate animals spend most of their life, the grassland production for a farmer is often decreased because of the grazing of this hoofed animal. Hitherto, decrease of grassland productiveness from a farmer's perspective, caused by the red deer grazing, was not yet researched in Slovenia. Similar studies were also very rare in other European countries. With the intention of gathering data and learn more about the potential harmfulness of the red deer on grassland production the experiment was performed in the south-eastern part of Slovenia in the year 2002. The influence of red deer grazing on grassland production for forage conservation at the forest border during the vegetation period was studied on three locations (Mala gora, Cvislerji and Mackovec) in the Kocevje region. The experiment lasted from the third decade of March until the first decade of October. Portable cages of size 1x0.5x0.5 m were used to exclude red deer from grazing the herbage. At four sampling dates in the season herbage air dry matter (DM) yield was measured at three different observations (cage-protected plot, cage-protected plot only two to three weeks before sampling date, otherwise freely grazed--removed and unprotected plot). The results from the experiment showed us that red deer grazed on grassland through all seasons and that the regeneration capability of sward was the highest in summer, middle in spring and smallest in autumn. On unprotected plots an average 50% reduction of herbage DM yield was found with the most distant sites also up to 80% reduction.
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Affiliation(s)
- S Trdan
- Biotechnical Faculty, Department of Agronomy, Chair of Entomology and Phytopathology, Jamnikarjeva 101, SI-1111 Ljubljana, Slovenia
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Abstract
An algorithm is described by means of which the Kekulé structures of a catacondensed benzenoid molecule (with h hexagons) are transformed into binary codes (of length h). By this, computer-aided manipulations with, and memory-storage of Kekulé structures are much facilitated. Any Kekulé structure can easily be recovered from its binary code.
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Affiliation(s)
- S Klavzar
- Department of Mathematics, PEF, University of Maribor, Pedagoska Fukultela Maribor, Slovenia.
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