1. L. S. Bondar', Byul. Izobr., No. 1, 64 (1958).
2. N. Ya. Grigor'eva, V. V. Veselovskii, and A. M. Moiseenkov, Khim.-farm. Zh., No. 7, 845–854 (1987).
3. A. G. Nigmatov, É. P. Serebryakov, and L. A. Yanovskaya, Khim.-farm. Zh., No. 7, 854–858 (1987).
4. É. P. Serebryakov and A. G. Nigmatov. Khim.-farm. Zh., No. 2, 104–112 (1990).
5. I. Fudzita, S. Omura, T. Nisida, et al., Ref. Zh. Khim. No. 6R553P (1985).