Khamanarong, K., W. Woraputtaporn, S. Ratanasuwan, M. Namking, W. Chaijaroonkhanarak, and S. Sae-Jung. “Occipitalization of the Atlas: Its Incidence and Clinical Implications”. Acta Medica Academica, vol. 42, no. 1, May 2013, pp. 41-45, doi:10.5644/ama2006-124.69.