S. J. Mpofu, T. A. Msagati, and R. W. M. Krauseb, “ PHYTOCHEMICAL ANALYSIS AND ANTIOXIDANT ACTIVITY OF CRUDE EXTRACTS FROM RHIZOMES OF ELEPHANTORRHIZA ELEPHANTINA AND PENTANISIA PRUNELLOIDES”., Afr J Tradit Complement Altern Med, vol. 11, no. 1, pp. 34–52, Oct. 2013.