Clinal nature of the frequencies of ovarioles and spermathecae in Cape worker honeybees, Apis mellifera capensisMananya Phiancharoen, Christian W.W. Pirk, Sarah E. Radloff and Randall HepburnApidologie, 41 2 (2010) 129-134DOI: https://doi.org/10.1051/apido/2009054