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2. X-Ray optics. http://www.x-ray-optics.com
3. V. N. Churilovsky, The Theory of Chromatism and Third-Order Aberrations (Mashinostroenie, Leningrad, 1968) [in Russian].
4. G. G. Slyusarev, Computational Methods for Optical Systems (Mashinostroenie, Leningrad, 1969) [in Russian].
5. M. A. Gan, Theory and Design Methods for Holographic and Kinoform Optical Elements (GOI, Leningrad, 1984) [in Russian].