Stevens CJ, Manning P, Van Den Berg LJL, De Graaf MCC, Wamelink GWW, Boxman AW, Bleeker A, Vergeer P, Arroniz-Crespo M, Limpens J, et al. Ecosystem responses to reduced and oxidised nitrogen inputs in European terrestrial habitats.  Environmental Pollution. 2011  ;159 :665-676.

De Graaf MCC, Bobbink R, Roelofs JGM, Verbank PJM. Differential effects of ammonium nitrate on three heathland species. Plant Ecology. 1998  ;135:185-196.