1. Uber diffuse endokrine epitheliale Organe;Feyrter,1938
2. The endocrine cells of the gastrointestinal tract: origins, morphology and functional relationships in health and disease;Pearse;Clin Gastroenterol,1974
3. Endocrine cells of the gastric mucosa;Solcia;Int Rev Cytol,1975
4. Silver stains in the study of the gut and pancreas;Grimelius;Invest Cell Pathol,1980
5. The classification of the human gastroenteropancreatic endocrine cells;Buchan;Invest Cell Pathol,1980