1. Ammonia monitoring—passive diffusion tube sampling;Andersen,1991
2. Ammonia emissions and their role in acid deposition;ApSimon;Atmospheric Environment,1987
3. Ammonia emission in Europe: updated emission and emission variations;Asman,1990
4. A detailed ammonia emission inventory for Denmark;Asman,1990
5. Estimated historical concentrations and depositions of ammonia and ammonium in Europe and their origin (1870–1980);Asman,1987