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Liebendörfer, Luzius; Herzig, Rolf; Urech, Martin; Ammann, Klaus (1988). Evaluation und calibration of the Swlss lichen-indication-method with important air pollutants. Staub - Reinhaltung der Luft, 48(6), pp. 233-238. Springer-Verlag
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
Urech, Martin; Herzig, Rolf; Liebendörfer, Luzius; Ammann, Klaus (1991). Flechten als Bioindikatoren der Luftverschmutzung in der Region Biel-Seeland: Kalibrierte Flechtenindikationsmethode und Passives Biomonitoring. In: Wanner, Heinz (ed.) Biel - Klima und Luftverschmutzung einer Schweizer Stadt (pp. 281-319). Bern, Stuttgart: Paul Haupt
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
