1. Über diffuse endocrine epitheliale Organe;Feyrter,1938
2. Evolution of the diffuse neuroendocrine system–clear cells and cloudy origins;Modlin;Neuroendocrinology,2006
3. Karzinoide Tumoren des Dünndarms;Oberndorfer;Frankf Z Pathol,1907
4. The classification of carcinoid tum ours;Williams;Lancet,1963
5. Updated population-based review of carcinoid tumors;Maggard;Ann Surg,2004