1. 1) DeLellis RA, Lloyd RV, Heitz PU, Eng C. Pathology and genetics tumor of endocrine organs. World Health Organization Classification of Tumors, 2004.
2. 2) Roth J, Komminoth P, Kloppel G, Heinz PU. Diabetes and the endocrine pancreas. In: Damjanov I, Linder J, eds. Andersons pathology. 10th ed. St. Louis: Mosby-Year Book, 1996: 2042-70.
3. Prognostic Factors in Pancreatic Endocrine Neoplasms: An Analysis of 136 Cases With a Proposal for Low-Grade and Intermediate-Grade Groups
4. Exocrine pancreatic tumours and their histological classification. A study based on 167 autopsy and 97 surgical cases