- Mattson, W. J., P. Niemela, I. Millers, and Y. Inguanzo. 1994. Immigrant phytophagous insects on woody plants in the United States and Canada: An annotated list. 27 pages.
- Annila, E., B. Langstrom, M. Varama, R. Hiukka, and P. Niemela. 1999. Susceptibility of defoliated Scots pine to spontaneous and induced attack by Tomicus piniperda and Tomicus minor . Silva Fennica 33:93-106.
- Kytö, M., P. Niemelä, and E. Annila. 1996. Vitality and bark beetle resistance of fertilized Norway spruce . Forest Ecology and Management 84:149-157.
- Mattson, W., P. Niemela, I. Millers, and Y. Inguanzo. 1994. Immigrant phytophagous insects on woody plants in the United States and Canada: an annotated list. United States Department of Agriculture, Forest Service, North Central Forest Experiment Station (Saint Paul, MN), General Technical Report NC-169. 27 pp.
- Valkama, H., M. Räty, and P. Niemela. 1997. Catches of Ips duplicates and other non-target Coleoptera by Ips typographus pheromone trapping . Entomologica Fennica 8:153-159.