1. Cooperatively breeding groups of the carrion crow Corvus corone corone in northern Spain;Baglione;Auk,2002
2. History, environment and social behaviour: experimentally induced cooperation in the carrion crow;Baglione;Proceedings of the Royal Society of London, Series B,2002
3. Helping and Communal Breeding in Birds: Ecology and Evolution;Brown,1987
4. The effect of linkage on paternity calculations;Chakravarti,1983
5. Charles, J. K. 1972, Territorial behaviour and the limitation of population size in Crows, Corvus corone and C. cornix, University of Aberdeen