1. ALTNOwN, H. 0. (1927). Archl. inttern. Med., 40, 757.
2. ARRUGA, H (1932). Arch. Oftal. hisp.-amizer., 32, 356.
3. La circulation retinienne;BALLIART, P.,1923
4. BEAU'IFUX, and PE'LSME, P. (1923). Arcli. Ophltal., Paris, 40, 65.
5. -The Physiological Basis of Medical Practice";BEST, C.H.; B, T.A.Y.L.O.R.N.,1939