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- Sieber, R., and G. Benz. 1985. The diapause of the birch engraver, Scolytus ratzeburg Janson (Col, Scolytidae), its termination by chilling, and manipulation with ecdysterone . Mitteilungen der Schweizerischen Entomologischen Gesellschaft 58:193-198.
- Zuber, M., and G. Benz. 1992. Untersuchungen uber das Schwarmverhalten von Ips typographus (L) und Pityogenes chalcographus (L) (Col, Scolytidae) mit den Pheromonpraparaten Pheroprax und Chalcoprax [Investigations on the flight behaviour of Ips typographus (L) and Pityogenes chalcographus (L) (Col, Scolytidae) by means of the pheromone preparations Pheroprax and Chalcoprax]. Journal of Applied Entomology 113:430-436.