@article {702,
	title = {Thinner eggshells of dipper (Cinclus cinclus) eggs from an acidified area compared to a non-acidified area in Norway},
	journal = {Water, Air and Soil Pollution},
	volume = {93},
	year = {1997},
	pages = {255-266},
	author = {Nybx, S. and Staurnes, M. and Erstad, K.J.}
}
@article {474,
	title = {Nutrient balance in Scots Pine Forest I: Design of experiments},
	journal = {Water, Air and Soil Pollution},
	volume = {85},
	year = {1995},
	pages = {1125-1130},
	author = {Abrahamsen, G. and Erstad, K.J.}
}
