Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Voute, A. D. 1950b. Optreden en bestrijding van de letterzetter (Ips typographus L) in ons land [Occurrence and control of the Ips typographus in our country] . Nederlandsch Boschbouw-Tijdschrift 22:1-4.