Variance in spermatozoa number among Apis dorsata drones and among Apis mellifera drones Gudrun Koeniger, Nikolaus Koeniger, Salim Tingek and Mananya Phiancharoen Apidologie, 36 2 (2005) 279-284 Published online: 01 June 2005 DOI: 10.1051/apido:2005009