1. R. Z. Dautova, V. S. Shklyaev, B. Ya. Syropyatov, and A. G. Mikhailovskii, Khim.-farm. Zh., 23(2), 172 - 176 (1989)
2. Pharm. Chem. J., 23(2), 133 - 136 (1989).
3. A. G. Mikhailovskii, B. Ya. Syropyatov, A. V. Dolzhenko, and M. I. Vakhrin, Nitrogen-containing Heterocycles and Alkaloids, Iridium-Press, Moscow, 2001, pp. 393 – 397.
4. B. Ya. Syropyatov, A. A. Gorbunov, V. S. Shklyaev, et al., Khim.-farm. Zh., 30(11), 13 - 14 (1996)
5. Pharm. Chem. J., 30(11), 675 - 677 (1996).