Krylov, E. N.; Volgina, L. V.; Isaeva, G. Yu. Journal of Organic Chemistry USSR (English Translation), 1983 , vol. 19, # 6 p. 1129 - 1133 Zhurnal Organicheskoi Khimii, 1983 , vol. 19, # 6 p. 1263 - 1268