Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Richter, D. 1967. Der Ruckgang einer Ips typographus- Massenvermehrung im Spiegel forstlicher Berichterstattung [Retrogression of a mass propagation of Ips typographus represented in forest reports] . Archiv fur Forstwesen 16:821-825.