[1]
A. Bertsch, H. Schweer, und A. Titze, „Discrimination of the bumblebee species Bombus lucorum, Bombus cryptarum and Bombus magnus by morphological characters and male labial gland secretions (Hymenoptera: Apidae)“., contrib.entomol., Bd. 54, Nr. 2, S. 365-386, Dez. 2004.