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2. (b) A.D. Buckingham, in Intermolecular Interactions: From Diatomics to Biopolymers, edited by B. Pullman (Wiley, New York, 1978), p. 1
3. (c) G.C. Maitland, M. Rigby, E.B. Smith and W.A. Wakeham, Intermolecular Forces (Oxford University Press, Oxford, 1981)
4. (d) A.J. Stone, The Theory of Intermolecular Forces (Clarendon Press, Oxford, 1996)
5. (e) A.D. Buckingham, Adv. Chem. Phys. 12, 107 (1967).