Polumbrik, O.M.; Ryabokon', I.G.; Skorobagat'ko, E.P.; Nesterenko, A.M.; Markovskii, L.N. Journal of Organic Chemistry USSR (English Translation), 1982 , vol. 18, p. 922 - 927 Zhurnal Organicheskoi Khimii, 1982 , vol. 18, # 5 p. 1065 - 1071