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2. Measurement of lens focal length using multi-curvature analysis of Shack-Hartmann wavefront data”;Neal,2004
3. Simple focal-length measurement technique with a circular Dammann grating”;Zhao,2007
4. Optical Imaging and Aberrations
5. Kingslake, R., Johnson, R.B., [Lens Desgin Fundamentals], 2nd edition, SPIE Press (2010).