1. V. N. Yarovenko, V. K. Taralashviii, I. V. Zavarzin, and M. M. Krayushkin,Tetrahedron, 1990,46, 3941.
2. V. N. Yarovenko, V. Z. Shirinyan, I. V. Zavarzin, and M. M. Krayushkin,Izv. Akad. Nauk SSSR, Ser. Khim., 1991, 2166 [Bull. Acad. Sci. USSR, Div. Chem. Sci., 1991,40, 1924 (Engl. Transl.)].
3. M. M. Krayushkin, V. N. Yarovenko, V. Z. Shirinyan,Tez. dokl. V Vsesoyuz. konf. po khimii azotsoderzhashchikh soedinenii [Abstrs. of 5th All-Union Conf. on the chemistry of nitrogen-containing compounds], Chernogolovka, 1991, p. 154 (in Russian).
4. I. Nematov, O. M. Petrukhina, A. T. Panfilov, I. M. Marov, A. E. Martirosov, and Sh. G. Talinov,Zh. Neorg. Khim., 1978,23, 1327 [J. Inorg. Chem. USSR, 1978,23 (Engl. Transl.)].