Oestges, C.; Paulraj, A.J.: 'Physical model for broadband wireless channels', Electronics Letters, 2001, 37, (19), p. 1195-1197, DOI: 10.1049/el:20010805
IET Digital Library, https://digital-library.theiet.org/;jsessionid=bk7dqke7e18ao.x-iet-live-01content/journals/10.1049/el_20010805