Volcho, K. P.; Tatarova, L. E.; Korchagina, D. V.; Salakhutdinov, N. F.; Aul'chenko, I. S.; et al. Russian Journal of Organic Chemistry, 1994 , vol. 30, # 5.1 p. 683 - 694 Zhurnal Organicheskoi Khimii, 1994 , vol. 30, # 5 p. 641 - 653