1. Feyrter F. Uber Diffuse Endokrine Epitheliale Organe. J.A. Barth: Leipzig 1938; 1–334.
2. Friedrich Feyrter: a precise intellect in a diffuse system;Champaneria;Neuroendocrinology,2006
3. The APUD cell concept and its implications in pathology;Pearse;Pathol Annu,1974
4. Neuroendocrine neoplasia: current concepts;Wick;Am J Clin Pathol,2000
5. Endocrine Pathology;Lloyd,1990