@article {283,
	title = {Human impacts on the nitrogen cycle: A global problem judged from a local perspective},
	journal = {Ambio},
	volume = {26},
	year = {1997},
	pages = {321-325},
	author = {Hessen, D.O. and Henriksen, A. and Hindar, A. and Mulder, J. and Torseth, K. and Vagstad, N.}
}
