@article {1563,
	title = {Evidence of widespread effects of ozone on crops and (semi-)natural vegetation in Europe (1990{\textendash}2006) in relation to AOT40- and flux-based risk maps.},
	journal = {Global Change Biology},
	volume = {17},
	year = {2011},
	pages = {592-613},
	author = {Mills, G. and Hayes, F. and Simpson, D. and Emberson, L. and Norris, D. and Harmens, H. and Buker, P.}
}
@article {1488,
	title = {New stomatal flux-based critical levels for ozone effects on vegetation.},
	journal = {Atmospheric Environment},
	volume = {45},
	year = {2011},
	pages = {5064-5068},
	author = {Mills, G. and Pleijel, H. and Braun, S. and Buker, P. and Bermejo, V. and Calvo, E. and Danielsson, H. and Emberson, L. and Gonzalez Fernandez, I. and Grunhage, L. and Harmens, H. and Hayes, F. and Karlsson, P.E. and Simpson, D.}
}
