Nekrasova, G. V.; Lipina, E. S.; Boldysh, E. E.; Perekalin, V. V. Journal of Organic Chemistry USSR (English Translation), 1988 , vol. 24, # 6 p. 1031 - 1035 Zhurnal Organicheskoi Khimii, 1988 , vol. 24, # 6 p. 1144 - 1150