F. G. Zampieri, M. Park, L. C. P. Azevedo, M. B. P. Amato, and E. L. V. Costa, “Effects of arterial oxygen tension and cardiac output on venous saturation: a mathematical modeling approach”, Clinics, vol. 67, no. 8, pp. 897–900, Aug. 2012, doi: 10.6061/clinics/2012(08)07.