Azad, A.; Taher, S.; Raihan, J.; Zahid, M. A.; Rahman, M.; Alam, M. I. Hyperbaric 0.5% Bupivacain Used in Subarachnoid Block Which Spread of Anesthesia to Cephalic at the Different Site of Injection Specially L 2-3, L 3-4, L 4-5 Inter Vertebral Space. TAJ: J of Teachers Assoc 2018, 28, 1-5.