Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Kohnle, U., J. Vité, E. Baader, H. Meyer, and W. Francke. 1991. Chirality of ipsdienol and ipsenol indicates a frass system in the spruce engraver, Ips typographus . Naturwissenschaften 78:136-138.
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