Beech trees exposed to high CO2 and to simulated summer ozone levels: effects on photosynthesis, chloroplast components and leaf enzyme activity. - Lütz,C..; Anegg,S..; Gerant,D..; Alaoui-Sossé,B..; Gérard,J..; Dizengremel,P.. (Physiologia Plantarum, 2000)