Fordred, Paul S.; Niyadurupola, D.Gangani; Wisedale, Richard; Bull, Stevend
Advanced Synthesis and Catalysis, 2009 , vol. 351, # 14-15 p. 2310 - 2314

Willstaetter; Hatt
Justus Liebigs Annalen der Chemie, 1919 , vol. 418, p. 152