Ferrell, G. T. 1988. Wound-induced oleoresins of Abies concolor: is it part of host resistance to the fir engraver Scolytus ventralis? Pages 305-312 in W. J. Mattson, J. Levieux, and C. Bernard-Dagan, Mechanisms of woody plant defenses against insects: search for pattern. Springer, New York. xiv + 416 p.