Title: Biblio RTF Export
Author: Biblio 7.x

Davies L, Bates JW, Bell JNB, James PW, Purvis OW. Diversity and sensitivity of epiphytes to oxides of nitrogen in London. Environmental Pollution . 2007  ;146:299-310.

Purvis OW, Coppins BJ, Hawksworth DL, James P, Moore DM. Lichen Flora of Great Britain and Ireland. London: The Natural History Museum; 1992 p. 710.