Usman, J. D., et al. “The Prevalence of the Absence of the Occipital (Posterior) Horns of the Lateral Ventricles Among Nigerians (2003 – 2008) Using Computerised Tomography”. International Journal of Health and Medical Information (IJHMI), vol. 1, no. 1-3, Dec. 2012, pp. 18-22, http://icidr.org.ng/index.php/Ijhmi/article/view/630.