Oyakhire, M. O., B. C. Didia, and B. E. Yellow. “Radiographic Evaluation of the Lumbar Lordotic Angle of the Spine in a Population of Nigerians”. Asian Journal of Medical Sciences, vol. 4, no. 3, June 2013, pp. 69-75, doi:10.3126/ajms.v4i3.4300.