Diaz, Gladys; Simoni, Noemien: 'Cloud networking evolution' (Telecommunications, 2017), 'Network as a Service for Next Generation Internet', Chap. 7, pp. 159-189, DOI: 10.1049/PBTE073E_ch7
IET Digital Library, https://digital-library.theiet.org/;jsessionid=8g78l6786f0pq.x-iet-live-01content/books/10.1049/pbte073e_ch7