Sorensen, Pernille Laerkedal; Clemmensen, Karina Engelbrecht; Michelsen, Anders et. al 2008 Plant and microbial uptake and allocation of organic and inorganic nitrogen related to plant growth forms and soil conditions at two subarctic tundra sites in Sweden Research article (Peer reviewed) DOI:10.1657/1523-0430(06-114)[SORENSEN]2.0.CO;2