1. L. M. Weinstock and P. J. Pollak, Adv. Heterocycl. Chem.,9, 107–163 (1969).
2. V. G. Pesin, Usp. Khim.,39, No. 2, 1950–1988 (1970).
3. F. Kurzer, in: Organic Compounds of Sulfur, Selenium, and Tellurium, London (1970), Vol. 1, p. 453.
4. F. Kurzer, ibid., Vol. 2, pp. 752–757 (1973).
5. F. Kurzer, ibid., Vol. 3, pp. 703–707 (1975).