Barba, A.; Guerrero, A.: 'Charging model based on QoS level for media streaming over P2P networks', IET Conference Proceedings, 2008, p. 21-21, DOI: 10.1049/cp:20081122
IET Digital Library, https://digital-library.theiet.org/;jsessionid=1j39eki53glqd.x-iet-live-01content/conferences/10.1049/cp_20081122