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A new pupillometer with an autho focus system by using pupil and iris area," Atsuhiko Iijima, Haruyuki Minamitani, Munetaka Haida, Norio Ishikawa, Yoshihisa Ota, Akinori Ueno, Minoru Nishimura, and Yukihito Shinohara,
IEEJ Transactions on Electronics, Information and Systems, vol.122-C, no.9, pp.1651-1657, Sep. 2002.
(DOI: https://doi.org/10.1541/ieejeiss1987.122.9_1651)