1. Ions and Ion Pairs in Organic Reactions Vol. I and II, M. Szwarc, ed., (Wiley, New York, 1972, 1974).
2. B. L. Erusalimskii,Mechanism of Ionic Polymerization. Current Problems (Plenum, New York, 1986).
3. J. Smid,Angew. Chem. Int. Ed. Engl. 11, 112 (1972).
4. T. E. Hogen Esch,Adv. Phys. Org. Chem. 15, 153 (1977).
5. F. W. Fowler, A. R. Katritzky, and R. J. D. Rutherford,J. Chem. Soc. (B), 460 (1971).