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Gautam, Suryakant and Gupta, Amit and Singh, G.S. (2015) Optical design of off-axis Cassegrain telescope using freeform surface at the secondary mirror. Optical Engineering, 54 (2). p. 25113. ISSN 0091-3286
Gautam, Suryakant and Gupta, Amit and Singh, G.S. (2014) Comparative assessment of optical performance for the optical design of HD-DVD micro objective lens with NA 0.65 using aspheric and freeform surfaces. Optik - International Journal for Light and Electron Optics, 125 (22). pp. 6845-6849. ISSN 0030-4026