@article {971, title = {Nitrogen deposition makes a minor contribution to carbon sequestration in temperate forests.}, journal = {Nature}, volume = {398}, year = {1999}, pages = {145-148}, author = {Nadelhoffer and Emmett, B.A. and Gundersen, P. and Kjonaas, O.J. and Koopmans, C.J. and Schleppi, P. and Tietema, A. and Wright, R.F.} }