CZ:Ref:PMID:19880681
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Sciubba DM, Cheng JJ, Petteys RJ, Weber KL, Frassica DA, Gokaslan ZL (2009). "Chordoma of the sacrum and vertebral bodies". J Am Acad Orthop Surg 17 (11): 708-17. PMID 19880681. [e]