v. Auwers
Justus Liebigs Annalen der Chemie, 1920 , vol. 420, p. 109

Journal of Organic Chemistry USSR (English Translation), , vol. 23, # 2 p. 291 - 294
Zhurnal Organicheskoi Khimii, , vol. 23, # 2 p. 327 - 331

Dneprovskii, A. S.; Pertsikov, B. Z.; Chertkov, V. A.
Journal of Organic Chemistry USSR (English Translation), 1987 , vol. 23, # 2 p. 291 - 294
Zhurnal Organicheskoi Khimii, 1987 , vol. 23, # 2 p. 327 - 331