Martinek , V. 1989. [Parasites of web-spinning sawflies of the genus Cephalcia Pz (Hymenoptera, Pamphiliidae) in the Czech Socialist Republic, Part IV Voltinism of Ichneumonid wasps of the genus Homaspis Foerst and Notopygus nigricornis Kriech (Hymenoptera, Ichneumonidae)]. Lesnictvi (Prague) 35:783-806.
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