1. Bender CJ (1986) Chem. Soc. Rev. 15: 475
2. Mulliken RS, Person W (1969) Molecular complexes. Wiley, New York
3. Foster R (ed) (1975, 1979) Molecular association. vols 1, 2. Academic, New York
4. Gordon M, Ware WR (eds) (1975) The exciplex. Academic, New York
5. Davidson RS (1983) Adv. Phys. Org. Chem. 19: 1