- Francke, W., V. Heemann, and K. Heyns. 1974a. Fluchtige Inhaltsstoffe von Ambrosiakafern (Coleoptera: Scolytidae). Zeitschrift fur Naturforschung 29c:243-245, 294.
- Francke, W., and K. Heyns. 1974b. Fluchtige Inhaltsstoffe von Ambrosiakafern (Coleoptera: Scolytidae) II. Zeitschrift fur Naturforschung 29c:246-247.
- Swart, A., and J. Heyns. 1997. Nematodes from Pinus radiata in South Africa (Nematoda: Cephalobinae, Rhabditinae, Aphelenchoidinae and Ektaphelenchidae). Journal of African Zoology 111 381-395.