Haneef, Sanam, et al. “Correlation of Mean PH, HCO3 and CO2 Between Arterial Blood Gases and Venous Blood Gases in Critically Ill Patients”. Pakistan Armed Forces Medical Journal, vol. 72, no. 5, Oct. 2022, pp. 1526-30, doi:10.51253/pafmj.v72i5.3156.