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4. Fistulous communications between the urinary and digestive tracts: Presentation of 5 cases. Review of the bibliography;Maldonado;Rev. Urol.,1961
5. Spontaneous reno-visceral fistulae with report of 2 cases of renoeolonic fistulae;Mertz;Trans. Am. Assn. Genito-Urin. Surg.,1931