1. Adaros, G., Weigel, H. J., and Jäger, H. J. (1991a). Single and interactive effects of low levels of 03, S02 andN02 on the growth and yield of spring rape. Environmental Pollution 72: 269–286.
2. Adaros, G., Weigel, H. J., and Jäger, H. J. (1991b). Concurrent exposure to S02 and/or N02 alters growth and yield responses of wheat and barley to low concentrations of 03. New Phytologist 118: 581–591.
3. Ashmore, M. R., and Ainsworth, N. (1995). The effects of ozone and cutting on the species composition of artificial grassland communities. Functional Ecology 9: 708–712.
4. Ashmore, M. R., Dalpra, C., and Tickle, A. K. (1987). Effects of ozone and calcium nutrition on native plant species. In: P. Mathy (Ed.), Air pollution and ecosystems (pp. 647–652). Dordrecht: Reidel.
5. Ashmore, M. R., Power, S. A., Cousins, D. A., and Ainsworth, N. (1996). Effects of ozone on native grass and forb species: A comparison of responses of individual plants and artificial communities. In: Critical levels for ozone in Europe: Testing and finalizing the concepts (pp. 193–197). Kuopio, Finland: UNECE Workshop Report, University of Kuopio.