Mokole, Eric L.; Sarkar, Tapan K.; Lagunas, MiguelAngel; Salazar Palma, Magdalena: 'Spectrum use, congestion, issues, and research areas at radio-frequencies' (Radar, Sonar and Navigation, 2018), 'Radar and Communication Spectrum Sharing', Chap. 5, pp. 135-173, DOI: 10.1049/SBRA515E_ch5
IET Digital Library, https://digital-library.theiet.org/;jsessionid=2jdvsf9ifoerb.x-iet-live-01content/books/10.1049/sbra515e_ch5