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Ref.223 : Cardini, Franco; Bonzi, Laura Morassi, Journal of Plant Physiology Volume162 Issue5 Pages517-528 Journal 2005 CODEN:JPPHEY ISSN:0176-1617 DOI:10.1016/j.jplph.2004.06.007, "Carotenoid composition and its chemotaxonomic significance in leaves of ten species of the genus Ceratozamia (Cycads)"
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