W.  Hackman, ?A checklist of Finnish Diptera. II. Cyclorrhapha?, Notulae Entomologicae, vol. 60, pp. 117-162, 1980.

W.  Hackman, ?Check list of Finnish Diptera - Pipunculidae and Syrphidae?, Notulae Entomologicae, vol. 60, pp. 120-124, 1980.