Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Grijpma, P., and W. Schuring. 1984a. De ontwikkeling van de bastkevers, Ips typographus, Ips cembrae en Pityogenes chalcographus in niet-marktwaardig dunning shout . Nederlands Bosbouwtijdschrift 56:159-164.
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