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@article{ Weidner1987,
 title = {Clean air: how the nations stand},
 author = {Weidner, Helmut},
 journal = {Acid news: a newsletter on air pollution and climate change},
 number = {3},
 pages = {8-10},
 year = {1987},
 issn = {0281-5087},
 keywords = {Luft; air; Umweltverschmutzung; environmental pollution; Luftreinhaltung; air pollution control; internationaler Vergleich; international comparison; Europa; Europe; Umweltpolitik; environmental policy}}