Beger, J.; Schiefer, H.
Journal fuer Praktische Chemie (Leipzig), 1980 , vol. 322, # 6 p. 1039 - 1047

Beger, J.; Schiefer, H.
Journal fuer Praktische Chemie (Leipzig), 1980 , vol. 322, # 6 p. 1039 - 1047

Zhilenskaya,T.D. et al.
Journal of Organic Chemistry USSR (English Translation), 1976 , vol. 12, # 7 p. 1382 - 1384
Zhurnal Organicheskoi Khimii, 1976 , vol. 12, # 7 p. 1392 - 1394

Larionova, L. A.; V'yunov, K. A.; Ginak, A. I.
Journal of Organic Chemistry USSR (English Translation), 1981 , p. 243 - 247
Zhurnal Organicheskoi Khimii, 1981 , vol. 17, # 2 p. 294 - 298