Chenkang Tang, ; Kumar, Vimal; Chaisiri, Sivadon: 'Understanding software-defined perimeter' (Security, 2017), 'Data Security in Cloud Computing', Chap. 7, pp. 151-169, DOI: 10.1049/PBSE007E_ch7 IET Digital Library, https://digital-library.theiet.org/;jsessionid=7po5gomk0c88q.x-iet-live-01content/books/10.1049/pbse007e_ch7