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What kind of information are you looking for?
If you are interested in species classification and know Danish or German try with Ringdahl (Översikt av de hittills i vårt land funna arterna tillhörande släktena Mydaea R.-D. och Helina. R.-D. (Muscidae), Entomologisk Tidskrift, 1924, 45(2-3): 39-66; Forsok till artgruppering inem slakene Phaonia R.-D.och Helina R. -D. (fam. Muscidae) Entomologisk Tidskrift, 1949, 70:136-146)or Hennig ("Die Fliegen der Palaearktischen Region: 63 b. Muscidae") respectively. Also Emden's "The fauna of India and the adjacent countries" may be useful. Recently many papers have also been published from China, both descriptiona of species and revisions of groups and sub-groups. In Skidmore's "The biology of the Muscidae of the World" you will find summary of larval morphology and biology. Unfortunately, these are quite largish books.