Dispersion Properties of Up-doping Photonic Crystal Fibers. Rafidain Journal of Science, [S. l.], v. 25, n. 1, p. 101–107, 2014. DOI: 10.33899/rjs.2014.86089. Disponível em: https://rsci.uomosul.edu.iq/index.php/rsci/article/view/46934. Acesso em: 28 jul. 2026.