Urban, C. de A. ., Urban, L. A. B. D. ., Lima, R. S. de . y Bleggi-Torres, L. F. . (2001) «Spontaneous Combined Internal and External Biliary Fistulae in Association with Gallstones and Gliomatosis of the Gallbladder », Revista Brasileira de Cancerologia, 47(3), pp. 273–276. doi: 10.32635/2176-9745.RBC.2001v47n3.2305.