Kleyi, Phumelele; Walmsley, Ryan S.; Gundhla, Isaac Z.; Walmsley, Tara A.; Jauka, Tembisa I.; Dames, Joanna; Walker, Roderick B.; Torto, Nelson; Tshentu, Zenixole R. South African Journal of Chemistry, 2012 , vol. 65, p. 231 - 238