1. Johnston RL (2002) Atomic and molecular clusters. CRC Press, Boca Raton
2. Scheiner S (1997) Hydrogen bonding: a theoretical perspective. Oxford, New York
3. Stone AJ (1996) The theory of intermolecular forces. Oxford, New York
4. Thakkar AJ (2001) In: Moore J, Spencer N (eds) Encyclopedia of chemical physics and physical chemistry, vol I. Fundamentals, chap. A1.5, pp 161–186. Institute of Physics Publishing, Bristol
5. Keutsch FN, Saykally RJ (2001) Proc Nat Acad Sci USA 98:10533