Liu, J. C. External Organizations;
Hüttl, Reinhard F. J. Deutsches GeoForschungsZentrum;
,
Liu, J. C., Hüttl, R. F. J. (1991): Relations between damage symptoms and nutritional status of Norway spruce stands (Picea abies Karst.) in southwestern Germany. - Fertilizer Research, 27, 1, 9-22.https://doi.org/10.1007/BF01048604