Yusubov, M. S.; Chi, Ki Whan; Krasnokutskaya, E. A.; Vasil'eva, V. P.; Filimonov, V. D. Russian Journal of Organic Chemistry, 1995 , vol. 31, # 11 p. 1503 - 1506 Zhurnal Organicheskoi Khimii, 1995 , vol. 31, # 11 p. 1675 - 1678