TY - Generic T1 - Estimating the uptake of traffic-derived NO2 from N-15 abundance in Norway spruce needles Y1 - 1999 A1 - Ammann, M. A1 - Siegwolf, R. A1 - Pichlmayer, F. A1 - Suter, M. A1 - Saure, M. A1 - Brunold, C. JF - Oecologia VL - 118(2) ER - TY - Generic T1 - Uptake and assimilation of atmospheric NO2-N by spruce needles (Picea abies): a field study Y1 - 1995 A1 - Ammann, M. A1 - von Ballmoos, P. A1 - Stalder, M. A1 - Suter, M. A1 - Brunold, C. JF - Water, Air and Soil Pollution VL - 85 ER -