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I would highly appreciate the PDFs of following Ptychopterid papers:
Tjeder, B. Notes on the Scandinavian Ptychopteridae, with description of a new species (Diptera) // Opusc. Ent. 1968. 33:73-79.
Peus F. (1958) Liriopeidae. In Lindner, E. (ed) Die Fliegen der Palaearktischen Region,pp. 10–44.
Thanks you very much!!
Libor