Orlov, V. Yu.; Kotov, A. D.; Bystryakova, E. B.; Kopeikin, V. V.; Mironov, G. S. Russian Journal of Organic Chemistry, 1994 , vol. 30, # 9 p. 1481 - 1484 Zhurnal Organicheskoi Khimii, 1994 , vol. 30, # 9 p. 1407 - 1410