Tapia, Juan: 'Gender classification from near infrared iris images' (Security, 2017), 'Iris and Periocular Biometric Recognition', Chap. 8, pp. 175-196, DOI: 10.1049/PBSE005E_ch8
IET Digital Library, https://digital-library.theiet.org/;jsessionid=1l8td78ui52jr.x-iet-live-01content/books/10.1049/pbse005e_ch8