@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.} } @article {817, title = {Ranking of epiphytic lichen sensitivity to air pollution using survey data: A comparison of indicator scales}, journal = {Lichenologist}, volume = {31}, year = {1999}, pages = {27-39}, author = {Van Dobben, H.J. and Ter Braak, C.J.F.} } @article {819, title = {Undergrowth as a biomonitor for deposition of N and acidity in pine forest.}, journal = {Forest Ecology and Management }, volume = {114}, year = {1999}, pages = {83-95}, author = {Van Dobben, H.J. and Ter Braak, C.J.F. and Dirske, G.M.} } @article {816, title = {Effects of atmospheric NH3 on epiphytic lichens in the Netherlands: The pitfalls of biological monitoring}, journal = {Atmospheric Environment }, volume = {32}, year = {1998}, pages = {551-557}, author = {van Dobben, H.F. and Ter Braak, C.J.F.} } @article {818, title = {Effects of atmospheric NH3 on epiphytic lichens in the Netherlands: the pitfalls of biological monitoring.}, journal = {Atmospheric Environment }, volume = {32}, year = {1998}, pages = {551-557}, author = {Van Dobben, H.J. and Ter Braak, C.J.F.} }