STUDY OF THE STRUCTURE OF PHOTONIC CRYSTAL FIBER WITH HIGH NEGATIVE DISPERSION COEFFICIENT . EPH-International Journal of Applied Science, [S. l.], v. 4, n. 3, p. 1–5, 2018. DOI: 10.53555/eijas.v4i3.76. Disponível em: http://eijas.com/index.php/as/article/view/76. Acesso em: 18 sep. 2025.