TRAN, H. T. Use Hierarchical Codebook to Improve the Primary User Detection in the Cognitive Radio’s Cooperative Spectrum Sensing. European Journal of Electrical Engineering and Computer Science, [S. l.], v. 5, n. 6, p. 22–28, 2021. DOI: 10.24018/ejece.2021.5.6.372. Disponível em: https://www.ejece.org/index.php/ejece/article/view/372. Acesso em: 22 sep. 2023.