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R.  Frey, ?Diptera Brachycera aus den arktischen Kunstengegenden Sibiriens?, [Akad. Nauk S.S.S.R.] Ross. Akad. Nauk Petrograd, Zap., Fiz.-Mat. Otd. (Acad. des Sci. de Russie, Mem., Cl. Phys.-Math.), vol. ser. 8, 19 (10), pp. 1-35, 1915.