Ojeda Castaneda, Jorge, and C. M. Gómez-Sarabia. “Optical Processor Arrays for Controlling Focal Length or for Tuning the Depth of Field”. Photonics Letters of Poland, vol. 3, no. 1, Mar. 2011, pp. pp. 44-46, doi:10.4302/photon. lett. pl.v3i1.174.