Ojeda Castaneda, Jorge, and Cristina Margarita Gómez-Sarabia. “Nonconventional Optical Systems Using Varifocal Lenses”. Photonics Letters of Poland 7, no. 1 (April 1, 2015): pp. 14–16. Accessed April 26, 2024. https://www.photonics.pl/PLP/index.php/letters/article/view/7-6.