Yonenaga, Akira; Shinzaki, Takashi: 'Mobile iris recognition' (Security, 2017), 'Iris and Periocular Biometric Recognition', Chap. 19, pp. 435-438, DOI: 10.1049/PBSE005E_ch19
IET Digital Library, https://digital-library.theiet.org/;jsessionid=e1s3qdifk99p8.x-iet-live-01content/books/10.1049/pbse005e_ch19