Structure-property relations in rare-earth doped GeO2-B2O3-Al2O3-PbO-PbF2 glasses by modern magnetic resonance techniques - Carvajal, E. E.; Doerenkamp, C.; Donoso, José Pedro; de Camargo, Andrea Simone Stucchi; Eckert, Hellmut (International Congress on Ceramics - ICC, 2018)