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- Dickens, J. C., A. Gutmann, T. L. Payne, L. C. Ryker, and J. A. Rudinsky. 1983. Antennal olfactory responsiveness of Douglas-fir beetle Dendroctonus pseudot- sugae Hopkins (Coleoptera Scolytidae) to pheromones and host odors . Journal of Chemical Ecology 9:1383-1396.
- Dickens, J. C., T. L. Payne, L. C. Ryker, and J. A. Rudinsky. 1984. Single cell responses of the Douglas-fir beetle, Dendroctonus pseudotsugae Hopkins (Coleopetera: Scolytidae), to pheromones and host odors . Journal of Chemical Ecology 10:583-600.
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- Oester, P. T., J. A. Rudinsky, and L. C. Ryker. 1981. Olfactory and acoustic behavior of Pseudohylesinus nebulosus (Coleoptera: Scolytidae) on Douglas fir bark . Canadian Entomologist 113:645-650.
- Oester, P. T., L. C. Ryker, and J. A. Rudinsky. 1978. Complex male premating stridulation of the bark beetle Hylurgops rufipennis (Mann) . Coleopterists' Bulletin 32:93-98.
- Rudinsky, J. A., P. T. Oester, and L. C. Ryker. 1978. Gallery initation and male stridulation of the polygamous spruce bark beetle Polygraphus rufipennis . Entomological Society of America, Annals 71:317-321.
- Rudinsky, J. A., and L. C. Ryker. 1976. Sound production in Scolytidae: rivalry and premating stridulation of male Douglas-fir beetle . Journal of Insect Physiology 22:997-1003.
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- Rudinsky, J. A., and L. C. Ryker. 1979. Field bioassay of male Douglas-fir beetle compound 3-methylcyclohex-3-en-1-one . Experientia 35:1302-1303.
- Rudinsky, J. A., and L. C. Ryker. 1980. Multifunctionality of Douglas-fir beetle pheromone 3, 2-MCH confirmed with solvent dibutyl phthalate . Journal of Chemical Ecology 6:193-201.
- Rudinsky, J. A., L. C. Ryker, R. R. Michael, L. M. Libbey, and M. E. Morgan. 1976. Sound production in Scolytidae: female sonic stimulus of male pheromone release in two Dendroctonus beetles . Journal of Insect Physiology 22:1675-1681.
- Rudinsky, J. A., V. Vallo, and L. C. Ryker. 1978. Sound production in Scolytidae: attraction and stridulation of Scolytus mali (Col, Scolytidae) . Zeitschrift fur Angewandte Entomologie 86:381-391.
- Ryker, L. C. 1975. Sound communication in beetles [abstract] . Oregon Entomological Society, Bulletin 57:467-468.
- Ryker, L. C., and L. M. Libbey. 1982. Frontalin in the male mountain pine beetle . Journal of Chemical Ecology 8:1399-1410.
- Ryker, L. C., L. M. Libbey, and J. A. Rudinsky. 1979. Comparison of volatile compounds and stridulation emitted by the Douglasfir beetle from Idaho and western Oregon populations . Environmental Entomology 8:789-798.
- Ryker, L. C., and P. T. Oester. 1982. Pseudohylesinus nebulosus (LeConte) (Col, Scolytidae): aggregation by primary attraction . Zeitschrift fur Angewandte Entomologie 94:377-382.
- Ryker, L. C., and J. A. Rudinsky. 1976a. Sound production in Scolytidae: acoustic signals of male and female Dendroctonus valens LeConte . Zeitschrift fur Angewandte Entomologie 80:113-118.
- Ryker, L. C., and J. A. Rudinsky. 1976b. Sound production in Scolytidae: aggressive and mating behaviour of the mountain pine beetle . Entomological Society of America, Annals 69:677-680.
- Ryker, L. C., and J. A. Rudinsky. 1976c. Sound production in Scolytidae: rivalry and premating stridulation of male Douglas-fir beetle . Journal of Insect Physiology 22:997-1003.
- Ryker, L. C., and J. A. Rudinsky. 1982. Field bioassay of exo- and endo -brevicomin with Dendroctonus ponderosae in lodgepole pine . Journal of Chemical Ecology 8:701-708.
- Ryker, L. C., and K. L. Yandell. 1983. Effect of verbenone on aggregation of Dendroctonus ponderosae Hopkins (Coleoptera, Scolytidae) to synthetic attractant . Zeitschrift fur Angewandte Entomologie 96:452-459.
- Schurig, V., R. Weber, G. J. Nicholson, A. C. Oehlenschlager, H. Pierce, A. M. Pierce, J. H. Borden, and L. C. Ryker. 1983. Enantiomer composition of natural exo- and endo brevicomin by complexation gas chromatography/selected ion mass spectrometry . Naturwissenschaften 70:92-93.
- Borden, J. H., L. C. Ryker, L. J. Chong, H. D. Pierce, B. D. Johnston, and A. C. Oehlschlager. 1987. Response of the mountain pine beetle, Dendroctonus ponderosae Hopkins (Coleoptera: Scolytidae), to five semiochemicals in British Columbia lodgepole pine forests . Canadian Journal of Forest Research 17:118-128.
- Dickens, J. C., T. L. Payne, L. C. Ryker, and J. A. Rudinsky. 1985. Multiple acceptors for pheromonal enantiomers on single olfactory cells in the Douglas-fir beetle, Dendroctonus pseudotsugae Hopk (Coleoptera: Scolytidae). Journal of Chemical Ecology 11:1359-1370.
- Libbey, L. M., L. C. Ryker, and K. L. Yandell. 1985. Laboratory and field studies of volatiles released by Dendroctonus ponderosae Hopkins (Coleoptera: Scolytidae) . Journal of Applied Entomology 100:381-392.
- Ryker, L. C. 1988. Acoustic studies of Dendroctonus bark beetles . Florida Entomologist 71:447-461.
- Swedenborg, P. D., R. L. Jones, and L. C. Ryker. 1989. Stridulation and associated behavior of the native elm bark beetle Hylurgopinus rufipes Eichhoff (Coleoptera: Scolytidae) . Canadian Entomologist 121:245-252.