Girdling of crownless Norway spruce snags: a measure against Ips typographus?

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Forster, B. (1997). Girdling of crownless Norway spruce snags: a measure against Ips typographus? In J. C. Grégoire, A. M. Liebhold, F. M. Stephen, K. R. Day, & S. M. Salom (Eds.), General technical report (GTR): Vol. NE-236. Proceedings integrating cultural tactics into the management of bark beetle and reforestation pests (pp. 101-104). USDA Forest Service.