@article {497,
	title = {Epiphyte recolonization of oaks along a gradient of air pollution in south-east England, 1979-1990. },
	volume = {68},
	year = {1990},
	pages = {81-99},
	author = {Bates, J.W. and Farmer, A.M. and Bell, J.N.B.}
}
