Wurm; Geres
Archiv der Pharmazie, 1990 , vol. 323, # 6 p. 319 - 322

Abeygunawardena, Chitrananda; Kumar, Vijaya; Marshall, David S.; Thomson, Ronald H.; Wickramaratne, D. B. Mahinda
Phytochemistry (Elsevier), 1991 , vol. 30, # 3 p. 941 - 945