Markova, Valentina; Ganchev, Todor: 'Technological support to stress-level monitoring' (Healthcare Technologies, 2017), 'Enhanced Living Environments: From models to technologies', Chap. 6, pp. 133-160, DOI: 10.1049/PBHE010E_ch6 IET Digital Library, https://digital-library.theiet.org/;jsessionid=972or2o06qpri.x-iet-live-01content/books/10.1049/pbhe010e_ch6