SEIFOURI, M.; KARKHANEHCHI, M. M.; ROHANI, S. Design of Multi-Layer Optical Fibers with Ring Refractive Index to Reduce Dispersion and Increase Bandwidth in Broadband Optical Networks. Engineering, Technology & Applied Science Research, Greece, v. 2, n. 3, p. 216–220, 2012. DOI: 10.48084/etasr.166. Disponível em: https://www.etasr.com/index.php/ETASR/article/view/166. Acesso em: 28 jan. 2022.