1. V. D. Dyanchenko, S. G. Krivokolysko, V. N. Nesterov, Yu. T. Struchkov, and V. P. Litvinov,Izv. Akad. Nauk, Ser. Khim., 1996, 2535 [Russ. Chem. Bull., 1996,45, 2405 (Engl. Transl.)].
2. V. I. Ram and M. Verma,Indian J. Chem. B, 1990,29, 624.
3. W.-D. Rudorf and M. Augustin,J. prakt. Chem., 1981,323, 55.
4. Obshchaya Organicheskaya Khimiya [Comprehensive Organic Chemistry], Ed. N. K. Kochetkov, Khimiya, Moscow, 1982 (in Russian).