1. Sex ratio in Ips typographus L. (Col. Scolytidae);Annila;Ann. Entomol. Fenn.,1971
2. Evidence of a population aggregating pheromone in Ips typographus (Coleoptera: Scolytidae);Bakke;Contrib. Boyce Thompson Inst.,1970
3. External morphology of Xyleborus ferrugineus (Fabr.) (Coleoptera: Scolytidae) I. Head and prothorax of adult males and females;Kingsolver;J. Morphol.,1977
4. Ecological researches on the Ezo Eight-spined Engraver, Ips typographus L. f. japonicus Niijima, with special reference to its reproduction, behavior and dispersal. IV External sexual markings, the sex ratio and attack behavior of the beetles. (In japanese with english summary.);Koizumi;Bull. Gov. For. Exp. Stn. (Tokyo),1967
5. Secondary sexual characters in the North American species of the genus Ips (Coleoptera: Scolytidae);Lanier;Can. Entomol.,1969