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Article (magazine) published 2009.

Authored by David Charles Zlesak

"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