Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Pitman, G. B., R. A. Kliefoth, and J. P. Vite. 1965. Studies on the pheromone of Ips confusus (LeConte). II. Further observations on the site of production. Boyce Thompson Institute for Plant Research, Contributions 23(1):13-17.