1. Arndt: Neue med. Welt1951.
2. Ashton: Vascular Changes in diabetes with particular reference to the retinal vessels. Department of pathology. London 1949.
3. Ballantyne: Arch. of Ophthalm.1939, 445 u. Diskussion 446/447.
4. Bertram: Die Zuckerkrankheit. Leipzig: Georg Thieme 1939.
5. Klin. Mbl. Augenheilk.1937.