- Lorenz, M; Augustin, S.; Becher, G.; Förster, M. (1997). Forest condition in europe : results of the 1996 crown condition survey : 1997 technical report. ICP forests : technical report of the forest condition in Europe. United Nations Economic Commission for Europe - European Commission: Geneva. 112 pp., meer
- UNECE (1997). Forest condition in europe : 1997 executive report. ICP forests : executive reports, 1997. United Nations Economic Commission for Europe - European Commission: Geneva. 41 pp., meer
|
