1. K. V. Vendrovskii and A. I. Veitsman, Sharpness in Photographic Images; Iconics, edited by D. S. Lebedev [in Russian], Moscow (1966).
2. V. V. Dmokhovskii, The Principles of X-Ray Technology [in Russian], Moscow (1960).
3. N. N. Blinov (editor), Diagnostic X-Ray Sets [in Russian], Moscow (1976).
4. F. H. Perrin, Usp. Fiz. Nauk,78, No. 2, 307–343 (1962).