Van Minh Nguyen, : 'Network densification' (Telecommunications, 2017), 'Access, Fronthaul and Backhaul Networks for 5G & Beyond', Chap. 1, pp. 3-24, DOI: 10.1049/PBTE074E_ch1 IET Digital Library, https://digital-library.theiet.org/;jsessionid=1g7c011bba5dt.x-iet-live-01content/books/10.1049/pbte074e_ch1