Ludwig, Stephan; Guillaume, René; Müller, Andreas: 'Physical layer security for real-world applications: use cases, results and open challenges' (Telecommunications, 2017), 'Trusted Communications with Physical Layer Security for 5G and Beyond', Chap. 17, pp. 423-455, DOI: 10.1049/PBTE076E_ch17 IET Digital Library, https://digital-library.theiet.org/;jsessionid=1olbhzmjnl2ki.x-iet-live-01content/books/10.1049/pbte076e_ch17