Duran M, Yamaguchi Y, Remington RB, Schaefer HF. Analytic energy second derivatives for paired-excited multi-configuration self-consistent-field wavefunctions. Application of the PE MCSCF model to H2O, CH2, HCN, HCCH, H2CO, NH3, CH4, and C2H4.
Chem Phys 1988. [DOI:
10.1016/0301-0104(88)87018-6]
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