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Herzig, Rolf; Liebendörfer, L; Urech, M; Ammann, Klaus; Cuecheva, M; Landolt, W (1988). Passive Biomonitoring with Lichens as a Part of an Integrated Biological Measuring System for Monitoring Air Pollution in Switzerland. International journal of environmental analytical chemistry, 35(1), pp. 43-57. Taylor & Francis 10.1080/03067318908028377
