1. COLLIER, R. M. An experimental study of form perception in peripheral vision. Journal of Comparative Psychology. 1931, 1, 281–289.
2. CRAWFORD, B. H. The luminous efficiency of light entering the eye pupil at different points and its relation to brightness threshold measurements. Proceedings of the Royal Society, B, 1937, 124, 81–96.
3. FRAISSE, P., EHRLICH, S., & VURPILLOT, E. Etudes de la centration perceptive par la méthode tachistoscopique. Archives de Psvchologte, 1956. 35,194–214.
4. GRINDLEY, G. C. Psychological factors in peripheral vision. Medical Research Council. Special Reporting Service. No. 163. 1931.
5. HELMHOLTZ, H. L. F.Treatise in physiological optics. Vol. 1. (Trans. from the 3rd German ed., J. P. C. Southall) New Yolk: Dover. 1962.