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4. Lipid loss with flight in the Douglas-fir beetle;Atkins;Can. Entomol.,1969
5. Bakke, A. , 1968a: Ecological studies on bark beetles (Coleoptera: Scolytidae) associated with scots pine (Pinus sylvestris L.) in Norway with particular reference to the influence of temperature. Meddelelser fra Det Norske Skogforsøksvesen, Nr. 83, Norwegian Forest Research Institute, Vollebekk, Norway.