@article {1523, title = {Ozone exposure thresholds and foliar injury on forest plants in Switzerland.}, journal = {Environmental Pollution}, volume = {111}, year = {2001}, pages = {321-331}, author = {VanderHayden, D. and Skelly, J. and Innes, J. and Hug, C. and Zhang, J. and Landolt, W. and Bleuler, P.} }