@article {525, title = {Chlorophyll a fluorescence emission, xanthophyll cycle activity and net photosynthetic rate responses to ozone in some foliose and fruticose lichen species}, journal = {Photosynthetica}, volume = {38}, year = {2000}, pages = {281-286}, author = {Calatayud, A. and Temple, P.J. and Barreno, E.} }