1. Davis Z, Moertel CG, Mclirath DC: The malignant carcinoid syndrome. Surg Gynec Obstet 137:637?644, 1973
2. Buchanan KD, Johnston CF, O'Hare MMT, et al: Neuroendocrine tumors. A European view. Am J Med 81 (Suppl 6b): 14?22, 1986
3. Solcia E, Capella C, Buffa R, Frigerio B, Usellini L, Fiocca R: Morphological and functional classification of endocrine cells and related growths in the gastrointestinal tract.In Gastrointestinal Hormones. GBJ Glass (ed). New York, Raven Press, 1988, pp 1?17.
4. Weil C: Gastroenteropancreatic endocrine tumors. Klivo 63:433?459, 1985
5. Simpson S, Vinik AI, Marangos PJ, Lloyd RV: Immunohistochemical localization of neuron-specific enolase in gastroentero-pancreatic neuroendocrine tumors. Correlation with tissue and serum levels of neuron-specific enolase. Cancer 54:1364, 1984