@article {159,
	title = {Empirical nitrogen critical loads: update since Lokeberg (1992)},
	year = {1995},
	pages = {9-19},
	institution = {Institute of Terrestrial Ecology},
	address = {Bush},
	author = {Bobbink, R. and Roelofs, J.G.M.},
	editor = {Hornung, M. and Sutton, M.A. and Wilson, R.B.}
}
