Quality of crown condition data
Dobbertin M, Landmann G, Pierrat JC & Müller-Edzards C
Dobbertin, M., Landmann, G., Pierrat, J. C., & Müller-Edzards, C. (1997). Quality of crown condition data. In C. Müller-Edzards, W. De Vries, & J. W. Erisman (Eds.), Ten years of monitoring forest condition in Europe. Studies on temporal development, spatial distribution and impacts of natural and anthropogenic stress factors (pp. 7-22). UNECE; EC.