In vitro Toxicity and genotoxic activity of aqueous leaf extracts from four varieties of Olea europea (L), Verschaeve, Luc, Edziri Hayet, Anthonissen R., Boujnah Dalenda, Skhiri Fethia, Chehab Hechmi, Aouni Mahjoub, and Mastouri Maha , Pharmacognosy Magazine, Jan-01-2017, Volume 13, Issue 49, Number 399, (2017)