1. Thresholds as dependent on some energy relations and characteristics of the subject;Bartlett,1965
2. La Perception Visualle de l' Espace.;Bourdon,1902
3. Die Empfindlichkeit des Augenpaars für Doppelbilder;Burchadt;Ann. Phys.,1861
4. The Physiology of the Eye;Davson,1963
5. The glow modulator as a source for rectangular light flashes;Engel;Vision Res.,1966