Phoenix GK, Emmett BA, Britton AJ, Caporn SJM, Dise NB, Helliwell R, Jones MLM, Leake JR, Leith ID, Sheppard LJ, et al. Impacts of atmospheric nitrogen deposition: responses of multiple plant and soil parameters across contrasting ecosystems in long-term field experiments. Global Change Biology. 2012  ;18:1197-1215.

Stevens CJ, Maskell LC, Smart SM, Caporn SJM, Dise NB, Gowing DJ. Identifying indicators of atmospheric nitrogen deposition impacts in acid grasslands. Biological Conservation. 2009  ;142:2069-2075.

Carroll JA, Caporn SJM, Morecrof MD, Lee JA, Johnson D, Taylor A, Leake JR, Campbell CD, Cawley L, Lei Y, et al. Natural vegetation responses to atmospheric nitrogen deposition - critical levels and loads of nitrogen for vegetation growing on contrasting native soils. Sheneld: University of Sheneld; 1997.