1. Bezborodov, V.S., Kovganko, N.N., and Lapanik, V.I., Vestsi Nats. Akad. Navuk Belarusi, Ser. Khim., 2003, no. 3, p. 76.
2. Min?ko, A.A., Bezborodov, V.S., Kovganko, N.N., and Lapanik, V.I., Vestn. Bel. Gos. Univ., Ser. 1, 2002, no. 3, p. 44.
3. Bezborodov, V.S., Kovganko, N.N., and Lapanik, V.I., Vestsi Nats. Akad. Navuk Belarusi, Ser. Khim., 2003, no. 1, p. 48.
4. Bezborodov, V.S., Kauhanka, N.N., Lapanik, V.I., and Lee, C.J., Liq. Cryst., 2003, vol. 30, p. 579.
5. Kanemasa, S. and Tsuge, O., Heterocycles, 1990, vol. 30, p. 719.