@misc{FrahmThoennesHensel2009, author = {Jan-Peter Frahm and Daniela Th{\"o}nnes and Stephanie Hensel}, title = {Ist der Anstieg nitrophiler Flechten an B{\"a}umen auf eine Erh{\"o}hung des Borken-pHs zur{\"u}ckzuf{\"u}hren?}, booktitle = {Archive for lichenology ; 1}, issn = {1868-4173}, series = {Archive for lichenology}, number = {1}, type = {workingpaper}, pages = {10}, year = {2009}, }