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Senter, P. (2006). Scapular orientation in theropods and basal birds and the origin of flapping flight. Acta Palaeontologica Polonica. 51(2): 305–313. PDF (页面存档备份,存于互联网档案馆)
Senter, P. (2006). Scapular orientation in theropods and basal birds and the origin of flapping flight. Acta Palaeontologica Polonica. 51(2): 305–313. PDF (页面存档备份,存于互联网档案馆)