Pfefferkorn, V/ Türk, R 1996: Flechten als Zeiger des Hemerobiegrades in terrestrischen Biotopen [Lichens - indicator of the human influences in forest ecosystems]. - Sauteria8: 181-192. [RLL List # 170 / Rec.# 14420] Keywords: AIR POLLUTION/ BIOINDICATORS/ CONSERVATION/ FORESTS/ HUMAN INFLUENCES