Igwilo, I. A., A. A. Oremosu, O. O. Kanu, and O. Dosumu. “Subnasio-Sella Distance for Transnasal Approach to the Sella Region: Indirect Vs. Direct Measurement on Sagittal Section of the Skull in Nigerians”. Asian Journal of Medical Sciences, vol. 5, no. 2, Dec. 2013, pp. 120-9, doi:10.3126/ajms.v5i2.8453.