M. VIJAYA LAKSHMI, V. B. (M.tech.). Survey on Relay and Beam forming Spectrum Sharing Cognitive Radio Networks. International Journal of Engineering and Computer Science, india, v. 5, n. 9, 2016. Disponível em: http://ijecs.in/index.php/ijecs/article/view/2458. Acesso em: 27 apr. 2024.