%0 Generic %D 2006 %T Diagnostic indicators of elevated nitrogen deposition %A Pitcairn, C.E.R. %A Fowler D. %A Leith, I.D. %A Sheppard, L.J. %A Tang, Y.S. %A Sutton, M.A. %A Famulari D. %B Environmental Pollution %V 144 %G eng