Fontecha, Jesús; Gónzalez, Iván; Villarreal, Vladimir; Bravo, José: 'Ambient intelligence for health: advances in vital signs and gait monitoring systems within mHealth environments' (Healthcare Technologies, 2017), 'Human Monitoring, Smart Health and Assisted Living: Techniques and technologies', Chap. 9, pp. 183-202, DOI: 10.1049/PBHE009E_ch9
IET Digital Library, https://digital-library.theiet.org/;jsessionid=1l1hi55iib8l4.x-iet-live-01content/books/10.1049/pbhe009e_ch9