N. Ravinder Kumar, K. Chandra Sekhar Rao, and P.Rajesh. “Prospective Study on Spondylolisthesis Patients Managed by Posterior Fixation”. International Journal of Health and Clinical Research, vol. 4, no. 12, Aug. 2021, pp. 378-82, https://ijhcr.com/index.php/ijhcr/article/view/2484.