by Stillman, R. A., Goss-Custard, J. D., West, A. D., S. E. A. Le V. Dit Durell, McGrorty, S., Caldow, R. W. G., Norris, K. J., Johnstone, I. G., Ens, B. J., Van Der Meer, J., Triplet, P.
Published in The Journal of applied ecology (01.08.2001)

by Fuller, Robert J., Atkinson, Philip W., Garnett, Martin C., Conway, Greg J., Bibby, Colin J., Johnstone, Ian G.
Published in Bird study (01.07.2006)

by Johnstone, I. G
Year of Publication 1994