Delgado, Bolívar, and José P Perrier. “Operatory Cholangiography.: Its Diagnosis Value in Choledocholithiasis”. Cirugía Del Uruguay, vol. 48, no. 4, Mar. 1978, pp. 275-7, https://replica-revista.scu.org.uy/index.php/cir_urug/article/view/2941.