Igoli, N., Z. Obanu, A. Gray, and C. Clements. “BIOACTIVE DITERPENES AND SESQUITERPENES FROM THE RHIZOMES OF WILD GINGER (SIPHONOCHILUS AETHIOPICUS (SCHWEINF) B.L BURTT)”. African Journal of Traditional, Complementary and Alternative Medicines, vol. 9, no. 1, Aug. 2011, pp. 88-93, https://journals.athmsi.org/index.php/ajtcam/article/view/1132.