Photosynthetic parameters of birch (Betula pendula Roth) leaves growing in normal and in CO2- and O3-enriched atmospheres. - Eichelmann,H..; Oja,V..; Rasulov,B..; Padu,E..; Bichele,I..; Pettai,H..; Tulva,I..; Kasparova,I..; Vapaavuori,E..; Laisk,A.. (Plant Cell Environ., 2004)