Ruhm, W., and C. Chararas. 1957. Description, biologie et histologic de quatre especes nouvelles de Nematodes parasites de Dryocoetes hectographus Reit. (Col. Scolytidae) [Description, biology and histology of four new species of nematode parasites of Drycoetes hectographus Reit. (Coleoptera: Scolytidae)]. Entomophaga 2(4):253-269.