TY - JOUR A1 - Franzen-Reuter, Isabelle A1 - Stapper, N. J. T1 - Mapping aerial hypertrophication with epiphytic lichens as biomonitors in North Rhine-Westphalia (NRW, Germany) T2 - English Nature Research Reports. Lichens in a changing pollution environment Y1 - 2004 UR - https://www.hb.fh-muenster.de/opus4/frontdoor/index/index/docId/7437 VL - 525 SP - 31 EP - 36 ER -