1. For a review of the CASSCF method see, for example: Roos BO (1987) Adv Chem Phys 69:399
2. For a review of the spin-coupled method see, for example: Cooper DL, Gerratt J, Raimondi M (1987) Adv Chem Phys 69:319
3. Thorsteinsson T (1995) Ph.D. Thesis, University of Liverpool, UK
4. Thorsteinsson T, Cooper DL, Gerratt J, Karadakov PB, Raimondi M (1996) Theor Chim Acta 93:343
5. Malmqvist PÅ (1986) Int J Quant Chem 30:479