Jillela, Raghavender; Ross, Arun: 'Matching iris images against face images using a joint dictionary-based sparse representation scheme' (Security, 2017), 'Iris and Periocular Biometric Recognition', Chap. 17, pp. 383-410, DOI: 10.1049/PBSE005E_ch17
IET Digital Library, https://digital-library.theiet.org/;jsessionid=mf76ok8uqs33.x-iet-live-01content/books/10.1049/pbse005e_ch17