Azad, S., A. Beg, and A. Chowdhury. “Cardiac Drugs Requirement During Off-Pump Coronary Artery Bypass (OPCAB) Surgery- A Comparison Between Combined High Thoracic Epidural Anaesthesia (HTEA) With GA and GA Alone”. Cardiovascular Journal, vol. 3, no. 1, Nov. 2010, pp. 7-10, doi:10.3329/cardio.v3i1.6420.