Biblio
Critical Levels for Ammonia. Atmospheric Ammonia. :375-382.
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2009. New science on the effects of nitrogen deposition and concentrations on Natura 2000 sites (theme 3): working group report. Nitrogen deposition and Natura 2000: Science and practice in determining environmental impacts. :129-136.
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2011. Can ammonia tolerance amongst lichen functional groups be explained by physiological responses? Environmental Pollution. 187:206-209.
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2014.