Borden, J., I. Wilson, R. Greis, L. Chong, H. Pierce, and G. Gries. 1998. Volatiles from the bark of trembling aspen, Populus tremuloides Michx (Salicaceae) disrupt secondary attraction by the mountain pine beetle, Dendroctonus ponderosae Hopkins (Col, Scolytidae). Chemoecology 8:09-75.