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Askew, R.R.; Shaw, M.R. 1997, Pteromalus apum (Retzius) and other pteromalid (Hym.) primary parasitoids of butterfly pupae in western Europe. Entomologist's Monthly Magazine
133:70
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Peck, O. 1963, A catalogue of the Nearctic Chalcidoidea (Insecta; Hymenoptera). Canadian Entomologist (Supplement)
30:696-698
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Thompson, W.R. 1958, A catalogue of the parasites and predators of insect pests. Section 2. Host parasite catalogue, Part 5.
pp.612
Commonwealth Agricultural Bureaux, Commonwealth Institute of Biological Control, Ottawa, Ontario, Canada
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Walker, F. 1835, Monographia Chalciditum. (Continued.) Entomological Magazine
3(2):204
(Parasitoid identification correct)
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