Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Birgersson, G., F. Schlyter, J. Lofqvist, and G. Bergstrom. 1984. Quantitative variation of pheromone components in the spruce bark beetle Ips typographus from different attack phases. Journal of Chemical Ecology 10:1029-1055.