Kokkinis, K. Vlychou, M. Stathopoulou, S. Lazoura, O. and Makris, N. Evangelopoulos, D. Benetos, I. Papadaki, P. and Korres, D. S., Chordomas of the upper cervical spine: radiographic evaluation. Study of
two cases and review of the literature, EUROPEAN JOURNAL OF ORTHOPAEDIC SURGERY AND TRAUMATOLOGY, (18), 3-8, 2008, Springer-Verlag,