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G. Ståhls, A. V. Barkalov: Taxonomic review of the Palaearctic species of the -group (Diptera, Syrphidae). In: ZooKeys. Nummer 662, 2017, S. 137–171, doi:10.3897/zookeys.662.11267, PMID 28769614, PMC 5539700 (freier Volltext).