Sakhabutdinov, A. G.; Usmanova, A. G.; Frolov, P. A.; Zinchenko, S. V.; Shmidt, F. K.
Journal of Organic Chemistry USSR (English Translation), 1992 , vol. 28, # 7.1 p. 1043 - 1047
Zhurnal Organicheskoi Khimii, 1992 , vol. 28, # 7 p. 1329 - 1333

Sakhabutdinov, A. G.; Usmanova, A. G.; Frolov, P. A.; Zinchenko, S. V.; Shmidt, F. K.
Russian Journal of Organic Chemistry, 1993 , vol. 29, # 9.1 p. 1487 - 1490
Zhurnal Organicheskoi Khimii, 1993 , vol. 29, # 9 p. 1790 - 1793