@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.} }