'Digital Subscriber Line Systems' (Telecommunications, 2008), 'Introduction to Broadband Communication Systems', Chap. 10, pp. 163-200, DOI: 10.1049/SBTE501E_ch10
IET Digital Library, https://digital-library.theiet.org/;jsessionid=m2s90rfrstk5.x-iet-live-01content/books/10.1049/sbte501e_ch10