Hassan, S., P. Thang, W. F. Muhd Shukeri, and S. Ismet. “Comparison of Analgesic Efficacy and Safety of Bupivacaine Plus Ketamine Versus Bupivacaine Alone in Rectus Sheath Block for Midline Laparotomy”. Anaesthesia, Pain & Intensive Care, Vol. 27, no. 2, Apr. 2023, pp. 220-6, doi:10.35975/apic.v27i2.2188.