A. V.  Barkalov, ?The role of structure of hypopygium in the systematics of the genus Cheilosia Meigen, 1822 (Diptera, Syrphidae)?, in Diptera (Insecta), their systematics, geographic distribution and ecology, O. A. [Ed.] Dipt Skarlato, Ed. USSR Academy of Sciences, Zoological Institute, 1983, pp. 3-7.