@article {1437, title = {The nutritional status of Picea abies (L.) Karst. across Europe, and implications for "forest decline".}, journal = {Trees}, volume = {4}, year = {1990}, pages = {211-224}, author = {Cape, J.N and Freer-Smith, P.H. and Paterson, I.S. and Parkinson, J.A. and Wolfenden, J.} }