- Safranyik, L., H. Barclay, A. Thomson, and W. Riel. 1999. A population dynamics model for the mountain pine beetle, Dendroctonus ponderosae Hopk. (Coleoptera: Scolytidae). Natural Resources Canada, Canadian Forestry Service, Pacific Forestry Centre (Victoria, British Columbia), Information Report BC-X-386. 35 pp.
- Shore, T., L. Safranyik, W. Riel, M. Ferguson, and J. Castonguay. 1999. Evaluation of factors affecting tree and stand susceptibility to the Douglas-fir beetle (Coleoptera: Scolytidae) . The Canadian Entomologist 131:831-839.