Huber, D.P.W., and Borden, J.H. 2003. Comparative behavioural responses of Dryocoetes confusus Swaine, Dendroctonus rufipennis(Kirby), and Dendroctonus ponderosae Hopkins (Coleoptera: Scolytidae) to angiosperm tree bark volatiles. Environmental Entomology 32:742 – 751. LINK