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European bees of the genera Epeolus Latreille, 1802 and Triepeolus Robertson, 1901 (Hymenoptera: Apidae: Nomadinae: Epeolini): taxonomy, identification key, distribution, and ecology

. Zootaxa. 4437, 1 (Jun. 2018), 1–60. DOI:https://doi.org/10.11646/zootaxa.4437.1.1.