1. Effects of N fertilization on fine roots and mycorrhizas in spruce humus;Alexander;Plant and Soil,1983
2. Effects of Nitrogen Fertilization on the Activity and Biomass of Fungi and Bacteria in a Podzolic Soil;Bååth;Zbl. Bakt. Hyg., Abt. Orig.,1981
3. The Effect of Fertilization on Growth and Mycorrhizae Numbers in 11-Year-Loblolly Pine Plantations;Menge;Forest Science,1977