Grava, I. Ya.; Polis, Ya. Yu.; Lidak, M. Yu.; Liepin'sh, E. E.; Shatts, V. D.; et al.
Journal of Organic Chemistry USSR (English Translation), 1981 , vol. 17, # 4 p. 679 - 686
Zhurnal Organicheskoi Khimii, 1981 , vol. 17, # 4 p. 778 - 786