Nimis PL, Scheidegger C, Wolseley PA. Monitoring with Lichens - Monitoring Lichens,Proceedings of the NATO Advanced Research Workshop on Lichen Monitoring, Wales, United Kingdom, 16-23 August 2000.  2002  .

Scheidegger C, Schroeter B. Effects of Ozone Fumigation on Epiphytic Macrolichens - Ultrastructure, CO2 Gas-Exchange and Chlorophyll Fluorescence. Environmental Pollution. 1995  ;88:260-262.