1. Dykstra CE (1988) Ab initio calculation of the structures and properties of molecules, Elsevier, Amsterdam
2. Tennyson J (1992) J Chem Soc Faraday Trans 2 88: 3271
3. Searles DJ, von Nagy-Felsobuki, EI (1991) In: Vibrational spectra and structure, Durig JR (Ed), Vol 19, Elsevier, Amsterdam
4. Wang F, Searles DJ, von Nagy-Felsobuki EI (1992) J Phys Chem 96: 6158
5. Dunning TH, Hay PJ (1977) In: Methods of electronic structure theory, Schaefer HF ( Ed) Plenum, New York