1. Babcock, W. W. and K. C. Jonas: Hemangioma of the colon. Am. J. Surg.80: 854, 1950.
2. Bacon, H. E.: Anus, Rectum, Sigmoid Colon: Diagnosis and Treatment. Ed. 3, Philadelphia, J. B. Lippincott Company, 1949, vol. 2, p. 541.
3. Bensaude, R.: Rectoscopie; Sigmoidoscopie. Ed. 3, Paris Masson et Cie, 1956, p. 142.
4. Boyd, William: Surgical Pathology. Ed. 5, Rio de Janeiro, Guanabara, 1946, p. 126.
5. Cantor, A. J.: Ambulatory Proctology. Ed. 2, New York, Paul B. Hoeber, Inc., 1952, p. 437.