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2. W. J. Smith,Modern Lens Design: A Resource Manual, pp. 88, 115, 150, 161, 162, McGraw-Hill, New York (1992).
3. M. Laikin,Lens Design, p. 95, Marcel Dekker (1995).
4. Aberration Theory and the Meaning of Life
5. Higher-order pupil aberrations in wide-angle and panoramic optical systems