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Herzig, Rolf; Urech, Martin; Liebendörfer, Luzius; Ammann, Klaus; Guecheva, M; Landolt, Werner (1990). Lichens as Biological Indicators of Air Pollution in Switzerland: Passive Biomonitoring as a Part of an Integrated Measuring System for Monitoring Air Pollution. In: Lieth, H; Markert, B (eds.) Workshop on element concentration cadaster (pp. 317-332). Weinheim: VCH Publishers
