@article {507,
	title = {Decline of the natterjack toad Bufo clamita in Britain: Paleoecological, documentary and experimental evidence for breeding site acidification},
	journal = {Biological Conservation},
	volume = {53},
	year = {1990},
	pages = {1-20},
	author = {Beebee, T.J.C. and Flower, R.J. and Stevenson, A.C. and Patrick, S.T. and Appleby, P.G. and Fletcher, C. and Marsh, C. and Natkanski, J. and Rippey, B. and Batterby, R.}
}
@book {60,
	title = {Lake Acidification in the United Kingdom 1800-1986},
	year = {1988},
	publisher = {ENSIS Publishing},
	organization = {ENSIS Publishing},
	address = {London},
	author = {Battarbee, R.W. and Anderson, N.J. and Appleby, P.G. and Flower, R.J. and Fritz, S.C. and Haworth, E.Y. and Higgitt, S. and Jones, V.J. and Kreiser, A. and Munro, M.A.R. and Natkanski, J. and Oldfield, F. and Patrick, S.T. and Richardson, N.G. and Rippey, B. and Stevenson, A.C.}
}
