1. Angervall, L., C. Hellerström, and B. Hellman: Development of the endocrine pancreas of rats as manifested by the appearance of argyrophylia and granulation. Path. et Microbiol. (Basel) 25, 389?399 (1962).
2. Bargmann, W.: Die Langerhansschen Inseln. In: Handbuch der mikroskopischen Anatomie des Menschen, herausgeg. von W. V. Möllendorff, Bd. VI/2. Berlin: Springer 1939.
3. Bencosme, S. A.: Studies on the methods of staining the islet cells of the pancreas. Arch. Path. 53, 87?97 (1952).
4. ?, and D. C. Pease: Electron microscopy of the pancreatic islets. Endocrinology 63, 1?13 (1958).
5. Bensley, R. R.: Studies on the pancreas of the guinea-pig. Amer. J. Anat. 12, 297?388 (1911).