TY - JOUR T1 - Ammonia: emission, atmospheric transport and deposition JF - New Phytologist Y1 - 1998 A1 - Asman, W.A.H. A1 - Sutton, M.A. A1 - Schjoerring, J.K. VL - 139 ER - TY - JOUR T1 - Modelled historical concentrations and depositions of ammonia and ammonium in Europe JF - Atmospheric Environment Y1 - 1988 A1 - Asman, W.A.H. A1 - Drukker, B. A1 - Janssen, A.J. VL - 22 ER -