@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.}
}
