Levermann, E.-M., Bischoff, I., & Wagner, T. 2000: Species-specific foraging strategies of the syntopical and synchronous bees Panurgus calcaratus (Scopoli, 1763) and Dasypoda hirtipes (Fabricius, 1793) (Hymenoptera: Apidae). - Beiträge Zur Entomologie = Contributions to Entomology 50(1): 179–191 - doi: 10.21248/contrib.entomol.50.1.179-191