Patil, M. C., P. V. Dhulkhed, and B. Prajwal. “Ultrasonographic Estimation of Gastric Volume in Patients After Overnight Fasting and After Ingestion of Clear Fluids Two Hours before Surgery”. Anaesthesia, Pain & Intensive Care, Vol. 24, no. 3, Aug. 2020, pp. 308-13, doi:10.35975/apic.v24i3.1283.