Nekrasova, G. V.; Lipina, E. S.; Zagibalova, L. Ya.; Perekalin, V. V. Journal of Organic Chemistry USSR (English Translation), 1981 , vol. 17, # 4 p. 619 - 623 Zhurnal Organicheskoi Khimii, 1981 , vol. 17, # 4 p. 711 - 716