Mach, Pavel, Zdenk Becvar, and Michal Vondra. “Distributed Hybrid Spectrum Access for Cognitive Femtocells in 5G Mobile Networks”. Elektronika ir Elektrotechnika 22, no. 6 (December 5, 2016): 85 - 91. Accessed April 26, 2024. https://eejournal.ktu.lt/index.php/elt/article/view/13474.