Hyadi, Amal; Rezki, Zouheir; Alouini, Mohamed-Slim: 'Secure data networks with channel uncertainty' (Telecommunications, 2017), 'Trusted Communications with Physical Layer Security for 5G and Beyond', Chap. 2, pp. 21-41, DOI: 10.1049/PBTE076E_ch2 IET Digital Library, https://digital-library.theiet.org/;jsessionid=14q7djur04jih.x-iet-live-01content/books/10.1049/pbte076e_ch2