SU, Xin; YU, Shichao; ZENG, Jie; KUANG, Yujun. Hierarchical Codebook Design for Massive MIMO. EAI Endorsed Transactions on Scalable Information Systems, [S. l.], v. 2, n. 4, p. e5, 2015. DOI: 10.4108/sis.2.4.e5. Disponível em: https://publications.eai.eu/index.php/sis/article/view/2310. Acesso em: 1 jan. 2026.