Gevorkyan, A.A.; Kazaryan, P.I.; Avakyan, S.V.; Simonyan, E.S.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1989 , vol. 25, # 3 p. 254 - 257
Khimiya Geterotsiklicheskikh Soedinenii, 1989 , # 3 p. 309 - 312

Gevorkyan, A. A.; Kazaryan, P. I.; Avakyan, S. V.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1988 , vol. 24, p. 110
Khimiya Geterotsiklicheskikh Soedinenii, 1988 , vol. 24, # 1 p. 131

Gevorkyan, A. A.; Kazaryan, P. I.; Avakyan, S. V.
Journal of Organic Chemistry USSR (English Translation), 1987 , vol. 23, # 5 p. 1002 - 1003
Zhurnal Organicheskoi Khimii, 1987 , vol. 23, # 5 p. 1110 - 1111