1. Metastatic melanoma of the gastrointestinal tract;DasGupta;Arch Surg,1964
2. Les tumeur melaniques primatives du rectum;Chalier;Rev Chir,1912
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4. Ueber Darm-invagination;Leichtenstern;Vrtljschr Prakt Heilk Prag,1873
5. Case report;Marchand;Berlin Klin Wschr,1896