1. Brodeur, A.: Radiologic diagnosis in infants and children. Saint Louis: C. V. Mosby & Co. 1965
2. Caffey, J.: Pediatric x-ray diagnosis. 6th ed. London: Yearbook Medical Publishers 1973
3. Progr. Pediat. Radiol.;O. Eklöf,1969
4. Figiel, L. S., Figiel, S. J.: Tumors of the terminal ileum. Diagnosis by retrograde filling during barium enema study. Amer. J. Roentgenol.91, 816 (1964)
5. Frimann-Dahl, J.: Roentgen examinations in acute abdominal diseases. Springfield, Ill.: Charles C. Thomas 1951