1. Bohn, U., et al., 2002 / 2003. Map of the Natural Vegetation of Europe Scale 1 : 2 500 000. 3 vols., Münster.
2. Classification and Regression Trees (CART);Breiman,1984
3. Heavy Metals in European Mosses: 2000 / 2001 Survey, ICP Vegetation Coordination Centre;Buse,2003
4. The probability of root disease on the Lolo National Forest, Montana;Byler;Canadian Journal of Forest Research,1990
5. Tree-based model;Clark,1992