@article {820,
	title = {Relationship between epiphytic lichens, trace elements and gaseous atmospheric pollutants},
	journal = {Environmental Pollution},
	volume = {112},
	year = {2001},
	pages = {163-169},
	author = {Van Dobben, H.J. and Wolterbeek, H.T. and Wamelink, G.W.W. and Ter Braak, C.J.F.}
}
