Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Christiansen, E., and A. Bakke. 1988b. Granbarkbillen, Hva nyere forskning har laert oss [The spruce bark beetle Ips typographus: a review of our present knowledge] [In Norwegian, English summary]. Norsk Institutt for Skogforskning, Rapport 4. 21 p.