@article {533, title = {Acidification and terrestrial birds}, volume = {BTO Research Report No.236}, year = {2000}, author = {Chamberlin, D.E. and Warren, R.W. and Crick, H.Q.P. and Hall, J. and Metcalfe, S. and Ormerod, S. and Whyatt, D. and Vickery, J.A.} }