Structural study of GeO2-PbO-PbF2 and B2O3-PbO-Al2O3-PbF2 glasses by solid state NMR and Raman spectroscopy - Carvajal, E.; Donoso, José Pedro; de Camargo, Andrea Simone Stucchi; Eckert, Hellmut (Brazilian Symposium on Glass and Related Materials - BRAZGLASS, 2017)