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Here's the full reference:
Meuffels, H. J. G. & Grootaert, P. 1990. The idenitity of Sciapus contristans (Wiedemann, 1817) (Diptera: Dolichopodidae), and a revision of the species group of its relatives. Bull. Inst R. Sci. Nat. Belg., Ent., 60: 161-178.