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ncbi.nlm.nih.gov
Laszczyk, Melanie (2009). «Pentacyclic Triterpenes of the Lupane, Oleanane and Ursane Group as Tools in Cancer Therapy». Planta Medica. 75 (15): 1549–60. PMID19742422. doi:10.1055/s-0029-1186102
Liu, Jie (dezembro de 1995). «Pharmacology of oleanolic acid and ursolic acid». Journal of Ethnopharmacology. 49 (2): 57–68. PMID8847885. doi:10.1016/0378-8741(95)90032-2