1. Mesropyan, E.G., Martirosyan, E.V., Ambartsumyan, G.B., Galoyan, L.A., and Avetisyan, A.A., Arm. Khim. Zh., 1989, vol. 42, p. 264.
2. Mesropyan, E.G., Ambartsumyan, G.B., Avetisyan, A.A., Sarkisyan, M.G., and Amazaspyan, G.S., Russ. J. Org. Chem., 2001, vol. 37, p. 1476.
3. Mesropyan, E.G., Ambartsumyan, G.B., Avetisyan, A.A., and Sarkisyan, M.G., Russ J. Org. Chem., 2003, vol. 39, p. 1130.
4. Mesropyan, E.G., Avetisyan, A.A., Galstyan, A.S., and Sargsyan, M.G., Uch. Zap. Erevan. Gos. Univ., 2003, no. 3, p. 93.