Hui-Ming Wang, ; Yi Zhang, ; Zhiguo Ding, : 'Physical layer security in non-orthogonal multiple access' (Telecommunications, 2017), 'Trusted Communications with Physical Layer Security for 5G and Beyond', Chap. 15, pp. 365-389, DOI: 10.1049/PBTE076E_ch15
IET Digital Library, https://digital-library.theiet.org/;jsessionid=1min6ut816h34.x-iet-live-01content/books/10.1049/pbte076e_ch15