L. Siregar and M. Ompusunggu, “Gastrointestinal Bleeding, Jejunum Perforation and Intussusceptions Ileo-Jejunal Segment with Multiple Polyposis Due to Metastasic Melanoma with Out Primary Cutaneus Melanoma?”, InaJGHE, vol. 5, no. 3, pp. 105–108, Jan. 2004.