Krokene, P., Christiansen, E., Solheim, H., Franceschi, V. R., & Berryman, A. A. (1999). Induced Resistance to Pathogenic Fungi in Norway Spruce. Oxford University Press.

Krokene, Paal, Erik Christiansen, Halvor Solheim, Vincent Ray Franceschi, und Alan Andrew Berryman. Induced Resistance to Pathogenic Fungi in Norway Spruce. Oxford University Press, 1999.

Krokene, Paal, et al. Induced Resistance to Pathogenic Fungi in Norway Spruce. Oxford University Press, 1999.