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Askew, R.R. 1985, A new species of Pteromalus Swederus (Hymenoptera: Pteromalidae) parasitic in galls of Pontania Costa (Hymenoptera: Tenthredinidae). Entomologica Scandinavica 16:233-236
Askew, R.R. 1995, The taxonomy and biology of some European Chalcidoidea (Hym.) associated with gall-forming sawflies (Hym., Tenthredinidae) on Salix. Entomologist's Monthly Magazine 131:243-252