Riva, A., F. Loy, R. Isola, M. Isola, and G. Conti. 2014. “The Understanding of the Anatomy and Functional Role of the Valves of the Veins and Its Impact on Hemodynamics”. Italian Journal of Anatomy and Embryology 118 (2):161. https://oajournals.fupress.net/index.php/ijae/article/view/3844.