Alam, M. R.; Bennamoun, M.; Togneri, R.; Sohel, F.: 'Deep neural networks for mobile person recognition with audio-visual signals' (Security, 2017), 'Mobile Biometrics', Chap. 4, pp. 97-129, DOI: 10.1049/PBSE003E_ch4 IET Digital Library, https://digital-library.theiet.org/;jsessionid=54dok34tub08s.x-iet-live-01content/books/10.1049/pbse003e_ch4