Sivakov, A.A.; Chistokletov, V.N.; Platonov, A.Yu.; Maiorova, E.D. Russian Journal of Organic Chemistry, 1994 , vol. 30, # 6.2 p. 1010 - 1011 Zhurnal Organicheskoi Khimii, 1994 , vol. 30, # 6 p. 947