'Multipath fading' (Telecommunications, 2017), 'Introduction to Digital Wireless Communications', Chap. 3, pp. 33-54, DOI: 10.1049/PBTE072E_ch3
IET Digital Library, https://digital-library.theiet.org/;jsessionid=19fvmrnfrwkb9.x-iet-live-01content/books/10.1049/pbte072e_ch3