Free-Air Exposure Systems to Scale up Ozone Research to Mature Trees - Karnosky, D F; Werner, H; Holopainen, T; Percy, K; Oksanen, T; Oksanen, E; Heerdt, C; Fabian, P; Nagy, J; Heilman, W; Cox, R; Nelson, N; Matyssek, R (Plant Biology, 2007)