1. The Taxane Diterpenoids
2. Cunningham AB, Mbenkum FT (1993): Sustainability of harvestingPrunus africana. bark in Cameroon: A medicinal plant in international trade. People and Plants Working Paper 2. Paris, UNESCO, p. 28.
3. DasGupta TK, Pezzuto JM (1997): Method and composition for selectively inhibiting melanoma using betulinic acid. US Patent No. 5,658,947.