Citation: U. Kirschbaum et K. Hanewald, Changes in the lichen vegetation at the long time investigation areas Melsungen and Limburg (Hesse/Germany) between 1997 and 1999, J APPL BOT, 75(1-2), 2001, pp. 20-30
Citation: U. Kirschbaum et K. Hanewald, Biological indication of air pollution by lichen mapping in long time observation areas in Hesse/Germany, J APPL BOT, 72(5-6), 1998, pp. 212-227