Evtimova, Mariya Savova: 'Big data healthcare system to improve healthcare information searching in the Internet' (Healthcare Technologies, 2017), 'Enhanced Living Environments: From models to technologies', Chap. 7, pp. 161-182, DOI: 10.1049/PBHE010E_ch7 IET Digital Library, https://digital-library.theiet.org/;jsessionid=5uti0bpf598r.x-iet-live-01content/books/10.1049/pbhe010e_ch7