Page, J. E.; Balza, F.; Nishida, T.; Towers, G. H. (1992). "Biologically active diterpenes from Aspilia mossambicensis, a chimpanzee medicinal plant". Phytochemistry. 31 (10): 3437–9. doi:10.1016/0031-9422(92)83702-z. PMID1368857.
Page, J. E.; Balza, F.; Nishida, T.; Towers, G. H. (1992). "Biologically active diterpenes from Aspilia mossambicensis, a chimpanzee medicinal plant". Phytochemistry. 31 (10): 3437–9. doi:10.1016/0031-9422(92)83702-z. PMID1368857.