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Askew, R.R. 1984, Species of Pnigalio and Chrysocharis (Hymenoptera: Eulophidae) parasitic on Tischeriidae (Lepidoptera), with the description of a new species. Entomologist's Gazette
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Askew, R.R.; Shaw, M.R. 1974, An account of the Chalcidoidea (Hymenoptera) parasitizing leaf-mining insects of deciduous trees in Britain. Biological Journal of the Linnean Society
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Askew, R.R.; Shaw, M.R. 1976, Chalcidoidea (Hymenoptera) at Abbot's Moss, Cheshire. Lancashire and Cheshire Fauna Society
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