Pureswaran, D. S., R. Gries, J. H. Borden, and H. D. Pierce. 2000. Dynamics of pheromone production and communication in the mountain pine beetle, Dendroctonus ponderosae Hopkins, and the pine engraver, Ips pini (Sag) (Coleoptera : Scolytidae). Chemoecology 10:153-158.