SINGLA, S. et al. Comparative Evaluation of Nalbuphine–Bupivacaine Versus Bupivacaine Alone in Ultrasound-Guided Axillary Brachial Plexus Block for Upper-Limb Surgery: A Cross-sectional Study. Student’s Journal of Health Research Africa, v. 7, n. 3, p. 9, 30 Sep.2026.