1. Comprehensive Supramolecular Chemistry; Atwood, J. L.; Davies, J. E. D.; MacNicol, D. D.; Vögtle, F., Eds.; Elsevier: Exeter, 1996, and references cited therein.
2. Rebek Jr., J. Acc. Chem. Res. 1990, 23, 399.
3. Adrian, J. C., Wilcox, C. S. J. Am. Chem. Soc. 1989, 111, 8055.
4. Scheerder, J.; Engbersen, J. F. J.; Casnati, A.; Ungaro, R.; Reinhoudt, D. N. J. Org. Chem. 1995, 60, 6448.
5. Goswami, S.; Hamilton, A. D.; Van Engen, D. J. Am. Chem. Soc. 1989, 111, 1090.