Beggs, Clive, Valentina Tavoni, Erica Menegatti, Mirko Tessari, Luca Giovanardi, Riccardo Ragazzi, and Anna Maria Malagoni. “Spectral Characteristics of the Internal Jugular Vein and Central Venous Pressure Pulses: A Proof of Concept Study”. Veins and Lymphatics 10, no. 1 (March 29, 2021). Accessed September 25, 2021. https://www.pagepressjournals.org/index.php/vl/article/view/9732.