Sciuto, Fernando, et al. “Correlation Between Doppler and Fhlebography in the Diagnosis of Clinically Suspected Acute Deep Venous Thrombosis”. Cirugía Del Uruguay, vol. 57, no. 4-5, Apr. 1987, pp. 127-9, https://replica-revista.scu.org.uy/index.php/cir_urug/article/view/3743.