@article {801,
	title = {A Review of the Likely Causal Pathways Relating the Reduced Density of Breeding Dippers Cinclus-Cinclus to the Acidification of Upland Streams},
	journal = {Environmental Pollution},
	volume = {78},
	year = {1992},
	pages = {49-55},
	author = {Tyler, S.J. and Ormerod, S.J.}
}
@article {1501,
	title = {Long-term change in the suitability of welsh streams for dippers Cinclus cinclus as a result of acidification and recovery: A modelling study.},
	journal = {Environmental Pollution},
	volume = {62},
	year = {1989},
	pages = {171-182},
	author = {Ormerod, S.J. and Tyler, S.J.}
}
