Clarke, Nathan: 'Biometric systems, modalities and attacks' (Security, 2018), 'Information Security: Foundations, Technologies and Applications', Chap. 4, pp. 57-92, DOI: 10.1049/PBSE001E_ch4
IET Digital Library, https://digital-library.theiet.org/;jsessionid=cetoysjrb3kq.x-iet-live-01content/books/10.1049/pbse001e_ch4