Nguyen, Ngoc Tan; Xuan Vu, Thang; Hoang, Dinh Thai; Nguyen, Diep N.; Dutkiewicz, Eryk: 'Open issues and future research directions' (Telecommunications, 2022), 'Enabling Technologies for Social Distancing: Fundamentals, concepts and solutions', Chap. 10, pp. 261-278, DOI: 10.1049/PBTE104E_ch10
IET Digital Library, https://digital-library.theiet.org/;jsessionid=ldgoarw67kjk.x-iet-live-01content/books/10.1049/pbte104e_ch10