An early cretaceous bird from Spain and its implications for the evolution of avian flight

1. Sanz, J.L.
2. Chiappe, L.M.
3. Perez-Moreno, B.P.
4. Buscalioni, A.D.
5. Moratalla, J.J.
6. Ortega, F.
7. Poyato-Ariza, F.J.