Borden, J., G. Gries, L. Chong, R. Werner, E. Holsten, H. Wieser, E. Dixon, and H. Cerezke. 1996. Regionally-specific bioactivity of two new pheromones for Dendroctonus rufipennis (Kirby) (Col, Scolytidae) . Journal of Applied Entomology 120:321-326.