Po-Han Huang, ; Wen, Charles H.-P: 'Flow management and orchestration for virtualized network functions in software-defined networks' (Telecommunications, 2017), 'Network as a Service for Next Generation Internet', Chap. 12, pp. 287-312, DOI: 10.1049/PBTE073E_ch12
IET Digital Library, https://digital-library.theiet.org/;jsessionid=b1dg1an1sj4an.x-iet-live-01content/books/10.1049/pbte073e_ch12