1. 1. Duke-Elder S: System of Ophthalmology 3:763 St. Louis C. V. Mosby Co. 1964.
2. 2. Tanaley JO: Cyst of the vitreous. Tr Am Ophth Soc. 9:507 1899.
3. 3. Brewerton EW: Cyst in the vitreous. Tr Ophth Soc U Kingdom 33:93 1913.
4. 4. Litinsky GA: Eine Bilaterale Runde Symmetrische Bildung in Glaskörper Klin Monatsbl f Augenh 87:205 1931.
5. 5. McLean AL: Cyst in the vitreous. Am J Ophth 16:51 1933.