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Margalida, AntonI; Oro, Daniel; Cortes-Avizanda, Ainara; Heredia, Rafael; Donazar, Jose A. (2011). Misleading Population Estimates: Biases and Consistency of Visual Surveys and Matrix Modelling in the Endangered Bearded Vulture. PLoS ONE, 6(10), e26784. Lawrence, Kans.: Public Library of Science 10.1371/journal.pone.0026784