Legon, A.C. (1999) Prereactive Complexes of Dihalogens XY with Lewis Bases B in the Gas Phase: A Systematic Case for the Halogen Analogue B small middle dot small middle dot small middle dotXY of the Hydrogen Bond B small middle dot small middle dot small middle dotHX. Angewandte Chemie International Edition (Engl.), 38, 2686- 2714.