Przheval'skii, N. M.; Drozd, V. N.
Journal of Organic Chemistry USSR (English Translation), 1990 , vol. 26, # 1.2 p. 184
Zhurnal Organicheskoi Khimii, 1990 , vol. 26, # 1 p. 214 - 215

Przheval'skii, N. M.; Stankevich, I. V.; Chistyakov, A. L.; Drozd, V. N.
Russian Journal of Organic Chemistry, 1993 , vol. 29, # 1.1 p. 58 - 62
Zhurnal Organicheskoi Khimii, 1993 , vol. 29, # 1 p. 70 - 75