TY - Generic T1 - Interactions of elevated CO2, NH3 and O3 on mycorrhizal infection, gas exchange and N metabolism in saplings of Scots pine. Y1 - 1995 A1 - Perez-Soba, M A1 - Dueck, T.A. A1 - Puppi, G. A1 - Kuiper, P.J.C. JF - Plant and Soil VL - 176 ER -