1. Galstian,T. V., [Smart Mini Cameras], CRC Press, Boca Raton, FL, (2014).
2. Zemax(tm), product of Radiant Zemax LLC, Redmond, WA.
3. Ray equation for a spatially variable uniaxial crystal and its use in the optical design of liquid-crystal lenses
4. ISO 12233 (1998), “Photography – Electronic still picture cameras – Resolution measurements,” ISO.