1. K. A. Jehnsen and B. Nygaard,Acta Chem. Scand.,3, No. 5, 481–486 (1949).
2. G. S. Smith,J. Chem. Soc., 1354–1358 (1937).
3. A. V. Nikolaev, S. V. Larionov, L. G. Lavrenova, and T. G. Leonova,Izv. Sib. Otd. Akad. Nauk SSSR, Ser. Khim. Nauk,1, 38–40 (1977).
4. Z. A. Savelieva, S. V. Larionov, and V. N. Ikorskii, ——ibid.,3, 89–92 (1982).
5. R. L. Davidovich, M. A. Medkov, M. D. Ryzaeva, and B. V. Bukvetskii,Izv. Akad. Nauk SSSR, Ser. Khim., No. 7, 1447–1452 (1982).