Reference

Paul Schmutz, Jürg B. Bucher, Madeleine S. Günthardt-Goerg, David Tarjan, Werner Landolt (1995): Response of Poplar to Ozone Alone and in Combination with NO2 at different Nitrogen Fertilization Levels. – Phyton, Annales Rei Botanicae, Horn – 35_2: 269 - 289.