Evans, D.J. and Morriss, G.P. (1988). Mol. Phys., 64, 521.

Holian, B.L. and Evans, D.J. (1985). J. Chem. Phys., 83, 3560.

Parry, W.E. (1973). The Many-body Problem (Clarendon Press).

Raimes, S. (1972). Many-electron Theory (North-Holland).