Patchareewan Chongchitmate, Vacharee Somsook, Praparat Hormchan, and Niphon Visarathanonth, “Bionomics of Entomopathogenic Nematode Steinernema siamkayai Stock, Somsook and Reid (n. sp.) and Its Efficacy Against Helicoverpa armigera Hübner (Lepidoptera: Noctuidae)”, Agr. Nat. Resour., vol. 39, no. 3, pp. 431–439, Sep. 2005.