Study of rare-earth doped GeO2-B2O3-Al2O3-PbO-PbF2 glasses by using MAS NMR and pulsed EPR techniques - Carvajal, Eduar E.; Doerenkamp, Carsten; Donoso, José Pedro; de Camargo, Andrea Simone Stucchi; Eckert, Hellmut (Encuentro Regional de Ciencias Físicas, 2018)