Khalil, Amir, et al. “CORRELATION OF INFERIOR VENA CAVA (IVC) DIAMETER AND CENTRAL VENOUS PRESSURE (CVP) FOR FLUID MONITORING IN ICU: (IVC) Diameter and (CVP) For Fluid Monitoring in ICU”. Pakistan Armed Forces Medical Journal, vol. 65, no. 2, Apr. 2015, pp. 235-8, https://pafmj.org/PAFMJ/article/view/828.