S. . Azad and A. . Beg, “Requirement of Postoperative Ventilation and analgesics during Off-Pump Coronary Artery Bypass (OPCAB) surgery – A Comparison between Combined High Thoracic Epidural Anaesthesia (HTEA) with GA and GA Alone”, Bangladesh Heart J, vol. 36, no. 2, pp. 74–81, Oct. 2021.