|| D. Bister , F. Mordarai, and Aveling, R. M., "COMPARISON OF 10 DIGITAL SLR CAMERAS FOR ORTHODONTIC PHOTOGRAPHY," Journal of Orthodontics, Vol.33, No. 3, pp.223-230|
 A. Friedman, and B. McLeod, "Optimal design of an optical lens," Archive for Rational Mechanics and Analysis 99, 147-164 (1987).
 R. Hain, C. J. Kahler, and C. Tropea, "Comparison of CCD, CMOS and intensified cameras," Experiments in Fluids 42, 403-411 (2007).
 N. Matsukawa, R. Mori, Y. Nakano, S. Nishioka, and K. Ohsawa, "Autofocus camera," (Google Patents, 1996).
 L. S. Weinblatt, "Camera autofocus technique," (Google Patents, 1986).
 L. Saurei, G. Mathieu, and B. Berge, "Design of an autofocus lens for VGA ¼-in. CCD and CMOS sensors," in Optical Systems Design(International Society for Optics and Photonics2004), pp. 288-296.
 R. Graham, A variable focus lens an dits use, J.O.S.A. vol 30, pp560-563, (1940).
 J. Wang, S. Zhai, and J. Canny, "Camera phone based motion sensing: interaction techniques, applications and performance study," in Proceedings of the 19th annual ACM symposium on User interface software and technology(ACM2006), pp. 101-110.
 R. Ballagas, J. Borchers, M. Rohs, and J. G. Sheridan, "The smart phone: A ubiquitous input device," Ieee Pervasive Computing 5, 70-77 (2006)
 R. Voelkel, "Natural optical design concepts for highly miniaturized camera systems," in Optical Systems Design and Production(International Society for Optics and Photonics1999), pp. 548-556.
 Y. Kawano, C. Abe, K. Abe, K. Hayashi, Y. Hatta, and K. Tamura, "Macro optical system for biological application," in International Symposium on Optical Science and Technology(International Society for Optics and Photonics2000), pp. 288-296.
 The acronym appears in sources as either "DPI" or lowercase "dpi". See: "Print Resolution Understanding 4-bit depth – Xerox" (PDF). Xerox.com. September 2012.
 A. Kumada, "A piezoelectric ultrasonic motor," Japanese Journal of Applied Physics 24, 739 (1985)
 P. M. Hubel, J. Liu, and R. J. Guttosch,"Spatial frequency response of color image sensors: Bayer color filters and Foveon X3" in Electronic Imaging 2004Anonymous (International Society for Optics and Photonics, 2004)
 Father of the Bayer filter dies aged 83, http://www.hdwarrior.co.uk/2012/ 11/23/father-of-the-bayer-filter-dies-aged-83/
 A. W. Greynolds, "Design, analysis, and fabrication of a really bad lens," in SPIE Optical Engineering+ Applications(International Society for Optics and Photonics2009), pp. 74290E-74290E-74298.
 C.-S. Liu, and P. D. Lin, "Miniaturized auto-focusing VCM actuator with zero holding current," Optics express 17, 9754-9763 (2009).
 D. J. Brady, and N. Hagen, "Multiscale lens design," Optics express 17, 10659-10674 (2009).