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By: Bertran, Joan. - Margalida, AType: ArticleIn: The journal of raptor researchVolume: 31Series:Issue: 3Date: 1997Page Range: 287--288Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Negro, J J - Margalida, AType: ArticleIn: The journal of raptor researchVolume: 34Series:Issue: 1Date: 2000Page Range: 62--63Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects:
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By: Bertran, Joan. - Margalida, AType: ArticleIn: The journal of raptor researchVolume: 36Series:Issue: 1Date: 2002Page Range: 66--70Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-Subjects: