Reference

Rainer Matyssek, S. Maurer, Madeleine S. Günthardt-Goerg, Werner Landolt, Andrea Polle, Matthias Saurer (1997): Nutrition Determines the "Strategy" of Betula pendula for Coping with Ozone Stress. – Phyton, Annales Rei Botanicae, Horn – 37_3: 157 - 167.