@article{article12120812,
title   = {Noninvasive cardiac output monitoring in cardiothoracic surgery patients: available methods and future directions},
author = {Saugel, Bernd and Cecconi, Maurizio and Hajjar, Ludhmila Abrahão},
year = {2019},
doi = {10.1053/j.jvca.2018.06.012},
journal   = {Journal of cardiothoracic and vascular anesthesia}
}