Rashi Agrawal, Sudarsan De, Alpana Srivastava, Sweety Gupta, Dinesh Singh, and Sandeep Agrawal, “Sacral Chordoma Metastatic to Bilateral Clavicle - A Rare Clinical Presentation and Review of Literature”, Asian J Med Sci, vol. 4, no. 4, pp. 24–27, Aug. 2013.