@article {839,
	title = {Artificial selection and heritability of ozone resistance in two populations of P. major L.},
	journal = {New Phytologist},
	volume = {137},
	year = {1997},
	pages = {645-655},
	author = {Whitfield, C.P. and Davison, A.W. and Ashenden, T.W.}
}
