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J. A. Donazar, F. Hiraldo, J. Bustamante, Factors Influencing Nest Site Selection, Breeding Density and Breeding Success in the Bearded Vulture (Gypaetus barbatus), Journal of Applied Ecology, Vol. 30, No. 3 (1993), pp. 504-514
Donázar et al. (Fri,) studied this question.
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