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Pollination efficiency of Apis mellifera (Hymenoptera: Apidae) on Helianthus annuus (Asteraceae) flowers at Dang (Ngaoundéré, Cameroon)
Egono Ndeme Carole Christèle, Kingha Tekombo Bernice Mireille, Fameni Tope Sidonie, Dounia, Tchuenguem Fohouo Fernand-Nestor
Int. J. Biosci. 13(3), 314-328, September 2018.

