1. Ab initiocalculation of force constants and equilibrium geometries in polyatomic molecules
2. Ab initiocalculation of force constants and equilibrium geometries in polyatomic molecules
3. R.D. Amos, CADPAC: The Cambridge Analytic Derivative Package, Publication CCP1/84/4, SERC, Daresbury, Warrington, WA4 4AD
4. J.S. Binkley, M.J. Frisch, D.J. Defrees, R. Krishnan, R.A. Whiteside, R. Seeger, H.B. Schlegel and J.A. Pople, GAUSSIAN 82, Carnegie-Melion University, Pittsburg, PA