Ignat'ev, N. V.; Datsenko, S. D.; Yagupol'skii, L. M.
Journal of Organic Chemistry USSR (English Translation), 1991 , vol. 27, # 5 p. 780 - 784
Zhurnal Organicheskoi Khimii, 1991 , vol. 27, # 5 p. 905 - 910

Fang, Yao-Ren; Westaway, Kenneth Charles
Canadian Journal of Chemistry, 1991 , vol. 69, # 6 p. 1017 - 1021