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An Early Cretaceous bird from Spain and its implications for the evolution of avian flight

José L. Sanz Luis M. Chiappe Bernardino P. Pérez-Moreno Angela D. Buscalioni José J. Moratalla Francisco Ortega & Francisco J. Poyato-Ariza

Nature 382, 442 - 445 (1996) | doi:10.1038/382442a0.

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