@article {1633, title = {Effects of SO2, NO2, and O3 on Population Development and Morphological and Physiological Parameters of Native Herb Layer Species in a Beech Forest.}, journal = {Environmental Pollution}, volume = {58}, year = {1989}, pages = {281-302}, author = {Steubing, L. and Fangmeier, A. and Both, R. and Frankenfeld, M.} }