Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Gehrken, U., and K. E. Zachariassen. 1977. Variations in the cold-hardiness of hibernating Ips acuminatus Gyllenhal (Col, Scolytidae) related to the sun exposure of the habitat . Norsk Entomologisk Tidsskrift 24:149-152.
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