G. Lübke

Mating expenditures reduced via female sex pheromone modulation in the primitively eusocial halictine bee, Lasioglossum (Evylaeus) malachurum (Hymenoptera: Halictidae)

M. Ayasse, W. Francke, W. Engels, 1999, Behavioral Ecology and Sociobiology.

Dose-dependent inhibition of emergency queen rearing by synthetic 9-ODA in the honey bee, Apis mellifera carnica

P. Rosenkranz, W. Francke, W. Engels, 1993, Journal of Comparative Physiology B.