Smith, M. T., R. Busch, T. L. Payne, and J. C. Dickens. 1988. Antennal olfactory responsiveness of three sympatric Ips species, Ips avulsus [Eichhoff], Ips calligraphus [Germar], Ips grandicollis [Eichhoff]), to intra- and interspecific behavioral chemicals . Journal of Chemical Ecology 14:1289-1304.