@article {1631, title = {Concurrent exposure to SO2 and/or NO2 alters groweth and Yield responses of wheat and barley to low concentrations of O3.}, journal = {New Phytologist}, volume = {118}, year = {1991}, pages = {581-591}, author = {Adaros, G. and Weigel, H.J. and Jager, H.J.} } @article {1643, title = {Single and Interactive Effects of Low Levels of O3, SO2 and NO2 on the Growth and Yield of Spring Rape.}, journal = {Environmental Pollution}, volume = {72}, year = {1991}, pages = {269-286}, author = {Adaros, G. and Weigel, H.J. and Jager, H.J.} } @article {1651, title = {Yield Responses of Different Crop Species to Long-Term Fumigation with Sulphur Dioxide in Open-Top Chambers}, journal = {Environmental Pollution}, volume = {67}, year = {1990}, pages = {15-28}, author = {Weigel, H.J. and Adaros, G. and Jager, H.J.} }