@article {1558, title = {Forest decline, nutrient supply and diagnostic fertilisation in southwestern Germany and in southern California. }, journal = {Forest Ecology and Management}, volume = {30}, year = {1990}, pages = {341-350}, author = {Huettl, R.F. and Fink, S. and Lutz, H.J. and Poth, M. and Wisniewski, J.} }