TY - Generic T1 - Nitrogen and drought effects on ectomycorrhizae of Norway spruce [Picea abries L. (Karst.)]. Y1 - 1998 A1 - Nilsen, P. A1 - Bxrja, I. A1 - Knitsen, H. A1 - Brean, R. JF - Plant and Soil VL - 198 ER -