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	volume = {32},
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	author = {Van Dobben, H.J. and Ter Braak, C.J.F.}
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@article {816,
	title = {Effects of atmospheric NH3 on epiphytic lichens in the Netherlands: The pitfalls of biological monitoring},
	journal = {Atmospheric Environment },
	volume = {32},
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	pages = {551-557},
	author = {van Dobben, H.F. and Ter Braak, C.J.F.}
}
