1. Action Plan for the Conservation of Western Lesser Kestrel Falco naumanni Populations;Biber;ICBP Study Report No. 41,1990
2. Birds of Prey in Europe;Bijleveld,1974
3. Ecological aspects of the Lesser Kestrel Falco naumanni in Extremadura (Spain);Bijlsma,1988
4. The breeding of the krestrel, Falco tinnunculus, in the reclaimed area Oostelijk Flevoland;Cavé;Neth. J. Zool.,1968
5. Organochlorines in bald eagle eggs;Coon,1983