1. Richards, W. G., Walker, T.E.H., Hinkley, R.K.: a Bibliography of ab initio Molecular Wave Functions. Oxford: Clarendon Press, 1971.
2. Richards, W. G., Walker, T.E.H., Farnell, L., Scott, P.R.: A Bibliography of ab initio Molecular Wave Functions: Supplement for 1973. Oxford: Clarendon Press, 1974.
3. See for example, Cotton, F.A.: Chemical Applications of Group Theory, 2nd Ed. New York: John Wiley & Sons, Inc., 1971.
4. England, W., Salmon, L.S., Ruedenberg, K.: Topics in Current Chemistry, 23, 31 (1971).
5. Pimentel, G.C., Spratley, R.D.: Chemical bonding Clarified Through Quantum Mechanics. San Francisco: Holden-Day Inc., 1969.