van Hove LWA, van Kooten O, van Wijk KJ, Vrendenberg WJ, Adema EH, Pieters GA. Physiological effects of long term exposure to low concentrations of SO2 and NH3 on poplar leaves.  Physiologia Plantarum. 1991  ;82:32-40.

van Hove LWA, van Kooten O, van Wijk KJ, Vredenberg WJ, Adema EH, Pieters GA. Physiological effects of long term exposure to low concentrations of SO2 and NH3 on poplar leaves. Plant Physiology. 1991  ;82:32-40.