@article {586,
	title = {nitrogen cycle in Lough Neagh, N. Ireland, 1975 to 1987},
	journal = {Int. Revue ges. Hydrobiol},
	volume = {77},
	year = {1992},
	pages = {73-83},
	author = {Gibson, C.E. and Smith, R.V. and Stewart, D.A.}
}
@article {766,
	title = {A regression model for nitrate leaching in Northern Ireland. },
	journal = {Soil Use and Management},
	volume = {5},
	year = {1989},
	pages = {71-76},
	author = {Smith, R.V. and Stewart, D.A.}
}
