Wright, R. F., & Tietema, A. (1995). Ecosystem response to 9 years of nitrogen addition at Sogndal, Norway. Forest Ecology and Management, (71), 133-142.
Tietema, A., & Wessel, W. W. (1994). Microbial activity and leaching during initial oak leaf litter decomposition.Biology and Fertility of Soils, (18), 49-54.
