Reduced cephalic labial glands in the male bumblebees of the subgenus Rhodobombus Dalla Torre (Hymenoptera: Apidae: Bombus Latreille)
Terzo, M., Coppens, P., Valterová, I., Toubeau, G., & Rasmont, P. (2007). Reduced cephalic labial glands in the male bumblebees of the subgenus Rhodobombus Dalla Torre (Hymenoptera: Apidae: Bombus Latreille). Annales de la Société entomologique de France (N.S.), 43(4), 497-503.