Glasses in the NaPO3-WO3-NaF ternary system: preparation, physical properties and structural studies - Munhoz, Joao F. V. L.; Santagneli, Silvia Helena; Oliveira Junior, Marcos de; Rodrigues, Ana Candida Martins; Eckert, Hellmut; Nalin, Marcelo (Journal of Non-Crystalline Solids, 2019)