Koren', A. O.; Gaponik, P. N.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1991 , vol. 27, # 9 p. 1036
Khimiya Geterotsiklicheskikh Soedinenii, 1991 , # 9 p. 1280 - 1281

Koren', A. O.; Gaponik, P. N.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1990 , vol. 26, # 12 p. 1366 - 1370
Khimiya Geterotsiklicheskikh Soedinenii, 1990 , # 12 p. 1643 - 1647

Koren', A. O.; Gaponik, P. N.
Chemistry of Heterocyclic Compounds (New York, NY, United States), 1991 , vol. 27, # 9 p. 1035
Khimiya Geterotsiklicheskikh Soedinenii, 1991 , # 9 p. 1280