Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Dubbel, V., and O. Vaupel. 1996. Optimierung des Falleneinsatzes bei Buchdrucker und Kupferstecher. [Optimization of the use of traps for Ips typographus and Pityogenes chalcogra-phus]. (In German). Forsttechnische Informationen No. 8:77-80.