Hu, D.; Hou, L.; Zhang, L. & Xu, X. (2009), "A pre-Archaeopteryx troodontid theropod from China with long feathers on the metatarsus", Nature, 461 (7264): 640–643, doi:10.1038/nature08322, PMID19794491, S2CID205218015
nih.gov
pubmed.ncbi.nlm.nih.gov
Hu, D.; Hou, L.; Zhang, L. & Xu, X. (2009), "A pre-Archaeopteryx troodontid theropod from China with long feathers on the metatarsus", Nature, 461 (7264): 640–643, doi:10.1038/nature08322, PMID19794491, S2CID205218015
Hu, D.; Hou, L.; Zhang, L. & Xu, X. (2009), "A pre-Archaeopteryx troodontid theropod from China with long feathers on the metatarsus", Nature, 461 (7264): 640–643, doi:10.1038/nature08322, PMID19794491, S2CID205218015