Islam, M. A.; Hossain, M. A.; Iqbal, A. A.; Parvez, M. Q.; Rana, M. M.; Goni, F.; Ahsanuzzaman, M. Marginal Resection of Sacral Chordoma through Posterior Approach: Study of 18 Cases. TAJ: J of Teachers Assoc 2018, 30, 21-26.