'ANTPOT.31 P' and 'ANTPOT.19 F' nuclear magnetic resonance investigation of fluoride glasses - Franco, Roberto Weider de Assis; Donoso, José Pedro; Magon, Claudio José; Schneider, José Fabian; Panepucci, Horácio Carlos; Messaddeq, Younnes; Ribeiro, Sidney J. L. (International Symposium on Non-Crystalline Solids in Brazil, 2001)