Systematics, ecology and phylogeographic significance of Olea europaea L. ssp. maroccana (Greuter and Burdet ) P. Vargas et al., a relictual olive tree in south-west Morocco. - Medail, ,F.,.; Quezel, ,P.,.; Besnard, ,G.,.; and Khadari, ,B.. (Bot. J. Linnean Soc., 2001)