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"Pollen Diameter and Guard Cell Length as Predictors of Ploidy in Diverse Rose Cultivars, Species, and Breeding Lines". Published in Floriculture and Ornamental Biotechnology 3, (Special Issue), 2009, pp. 53-70
http://globalsciencebooks.info/Online/GSBOnline/images/0906/FOB_3(SI1)/FOB_3(SI1)53-70o.pdf