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- [9] How can we define a feathered dinosaur as a bird? NEW PERSPECTIVES ON THE ORIGIN AND EARLY EVOLUTION OF BIRDS, 2001, : 43 - 46
- [10] Feathered dinosaur or bird?: A new look at the hand of Archaeopteryx AVIAN PALEONTOLOGY AT THE CLOSE OF THE 20TH CENTURY, 1999, (89): : 289 - 293