Investigation into the genotoxicity of water extracts from Hypoxis species and a commercially available Hypoxis preparation., Verschaeve, Luc, Mertens Birgit, Ndhlala A R., Anthonissen R, Gorissen B, and Van Staden J , Phytother Res, 2013 Mar, Volume 27, Issue 3, p.350-6, (2013)