[1]
A. Bertsch und H. Schweer, „Cephalic labial gland secretions of males as species recognition signals in bumblebees: are there really geographical variations in the secretions of the Bombus terrestris subspecies? (Hymenoptera: Apidae: Bombus)“., contrib.entomol., Bd. 62, Nr. 1, S. 103–124, Mai 2012.