ALGBURI , N. An Investigation of Channel Estimation in RIS-NOMA with the 6G Network. Int. J. Electr. Eng. Sustain., Libya, v. 2, n. 1, p. 20–30, 2024. DOI: 10.65998/ijees.v2i1.72. Disponível em: https://ijees.org/index.php/ijees/article/view/72. Acesso em: 5 apr. 2026.