Weil
Monatshefte fuer Chemie, 1908 , vol. 29, p. 903

Tetsuhashi, Masashi; Ishikawa, Minoru; Hashimoto, Mariko; Hashimoto, Yuichi; Aoyama, Hiroshi
Bioorganic and Medicinal Chemistry, 2010 , vol. 18, # 14 p. 5323 - 5338

Borovkov, V. V.; Evstigneeva, R. P.; Filippovich, E. I.; Rozynov, B. V.
Doklady Chemistry, 1989 , vol. 308, # 4-6 p. 275 - 279
Dokl. Akad. Nauk SSSR Ser. Khim., 1989 , vol. 308, # 4 p. 874 - 878