Qureshi, Lt Col Muhammad Assad, et al. “OUTCOME OF INSTRUMENTED SPINAL FUSION FOR CHRONIC LOW BACK PAIN: REVIEW OF 100 PATIENTS: Instrument Spinal Fusion”. Pakistan Armed Forces Medical Journal, vol. 60, no. 1, Mar. 2010, pp. 63-8, https://pafmj.org/PAFMJ/article/view/210.