1. Hirschfelder, J.O., Curtiss, C.F. and Bird, R.B. 1954.Molecular Theory of Gases and Liquids, 922–922. New York: John Wiley and Sons, Inc.
2. The Mutual Repulsive Potential of Closed Shells
3. See, for example Hirschfelder J.O. Curtiss C.F. Bird R.B.Molecular Theory of Gases and LiquidsJohn Wiley and Sons, Inc. New York 1954 923 923