1. ASHTON, N. (1961). Trans. ophthal. Soc. U.K., 81, 145.
2. BEETHAM, W. P. (1963). Brit. J. Ophthal., 47, 611.
3. DOBRE, J. H. (1964). Trans. ophthal. Soc. U.K., 84, 521.
4. LUNDBAECK, K. (1963). J. roy. Coll. Surg. Ireland, 1, 28.
5. Light Coagulation;MEYER-SCHWICKERATH, G.,1960