Siciliano, Pietro; Leone, Alessandro; Caroppo, Andrea; Diraco, Giovanni; Rescio, Gabriele: 'Multi-sensor platform for circadian rhythm analysis' (Healthcare Technologies, 2017), 'Human Monitoring, Smart Health and Assisted Living: Techniques and technologies', Chap. 6, pp. 123-140, DOI: 10.1049/PBHE009E_ch6
IET Digital Library, https://digital-library.theiet.org/;jsessionid=cvr34apf07u.x-iet-live-01content/books/10.1049/pbhe009e_ch6