Adventkalender, 12. Dezember

Robert A. Haack, Robert K. Lawrence, George C. Heaton: "Tomicus piniperda (Coleoptera: Scolytidae) Shoot-Feeding Characteristics and Overwintering Behavior in Scotch Pine Christmas Trees". In: Journal of Economic Entomology 94 (2001) 2, S. 422 – 429