Bhatty, Q.A. et al. 2025. Ultrasound Assisted versus Landmark Guided Spinal Anesthesia in Patients with  Abnormal Spinal Anatomy. Pakistan Armed Forces Medical Journal. 75, 1 (Feb. 2025), 21–24. DOI:https://doi.org/10.51253/pafmj.v75i1.8885.