1. Allen, M. J.: The dependence of cyclophoria on convergence, elevation and the system of axes. Amer. J. Optom. 31, 297?307 (1954)
2. Alpern, M.: Movements of the eyes. In: H. Davson (ed.), The eye, vol. 3, Muscular mechanisms. New York: Academic Press 1962
3. Alpern, M.: Eye movements. In: D. Jameson and L. M. Hurvich (eds.), Visual psychophysics, Handbook of sensory physiology, vol. VII/4. Berlin-Heidelberg-New York: Springer 1972
4. Ames, A., Jr.: Cyclophoria. Amer. J. physiol. Optics 7, 3?38 (1926)
5. Ames, A., Jr., Ogle, K. N., Gliddon, G. H.: Corresponding retinal points, the horopter and size and shape of ocular images. Part I. J. opt. Soc. Amer. 22, 538?574 (1932a)