Duelli, P., Zahradník, P., Knížek, M., Kalinová, B. Migration in Spruce Bark Beetles (.I.Ips typographus./I. L.) and the Efficiency of Pheromone Traps. Journal of Applied Entomology. 1997, 121(-), 297-303. ISSN 0931-2048. E-ISSN 1439-0418.