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Palaearctic Osmia bees of the subgenera Hemiosmia, Tergosmia and Erythrosmia (Megachilidae, Osmiini): biology, taxonomy and key to species

. Zootaxa. 4778, 2 (May 2020), 201–236. DOI:https://doi.org/10.11646/zootaxa.4778.2.1.