1. S. Wilson, Methods in Computational Molecular Physics, ed. G.H.F. Diercksen and S. Wilson, Reidel, Dordrecht (1983)
2. S. Wilson, Adv. Chem. Phys. 67, 439 (1987)
3. C. Schwartz, Meth. Comput. Phys. 2, 241 (1962)
4. K. Ruedenberg, R.C. Raffenetti and R. Bardo, in Energy structure and reactivity, Proc. 2nd. Boulder Resarch Confer. in Theoret. Chem., Wiley, New York (1973)
5. R.C. Raffenetti, J. Chem. Phys. 58, 4452 (1973)