Othman, Asem; Mather, Francis; Hoyos, Hector: '4F™-ID: mobile four-fingers biometrics system' (Security, 2017), 'Mobile Biometrics', Chap. 11, pp. 279-298, DOI: 10.1049/PBSE003E_ch11
IET Digital Library, https://digital-library.theiet.org/;jsessionid=6ale8c76448ga.x-iet-live-01content/books/10.1049/pbse003e_ch11