Molchanov, A. P.; Kostikov, R. R.; Chernyshev, V. A. Journal of Organic Chemistry USSR (English Translation), 1991 , vol. 27, # 8.1 p. 1444 - 1449 Zhurnal Organicheskoi Khimii, 1991 , vol. 27, # 8 p. 1648 - 1654