@article {1477, title = {Aluminium concentration versus the base cation to aluminium ratio as predictors for aluminium toxicity in Pinus sylvestris and Picea abies seedlings.}, journal = {Forest Ecology and Management}, volume = {195}, year = {2004}, pages = {301-309}, author = {Van Scholl, L. and Keltjens, W.G. and Hoffland, E. and Van Breemen, N.} }