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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, PMID 19794491
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nih.gov
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, PMID 19794491
springer.com
link.springer.com
Xu, X.; Zhao, Q.; Norell, M.; Sullivan, C.; Hone, D.; Erickson, G.; Wang, X.; Han, F.; et al. (2009), ”A new feathered maniraptoran dinosaur fossil that fills a morphological gap in avian origin”, Chinese Science Bulletin 54: 430–435, doi:10.1007/s11434-009-0009-6Abstract