M.C.D.Speight & J.-P.Sarthou: StN Keys for the Identification of adult European Syrphidae (Diptera). A special issue of the StN Keys to commemorate the occasion of the 6th International Symposium on the Syrphidae, University of Glasgow, 2011. PDF
M.C.D.Speight: Species Accounts of European Syrphidae (Diptera) 2013. Syrph the Net, the database of European Syrphidae, vol.72, 316 pp., Dublin. PDF
Doczkal D. und Dziock F. (2004): Two new species of Brachyopa Meigen from Germany, with notes on B. grunewaldensis Kassebeer (Diptera, Syrphidae). Volucella 7: 35–60. PDF (Memento vom 2. April 2015 im Internet Archive)