Xu, Ran; Fazio, Gia C.; Matsuda, Seiichi P.T. (2004). „On the origins of triterpenoid skeletal diversity”. Phytochemistry. 65 (3): 261—291. doi:10.1016/j.phytochem.2003.11.014.
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.
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.