'PB''F IND. 2'-modified heavy metal oxide borate glasses: structural studies by solid state NMR - Fernandes, R. G.; Ren, J.; Eckert, Hellmut; Hernandes, Antônio Carlos; de Camargo, Andrea Simone Stucchi (The International Symposium on Non Oxide Glasses and New Optical Glasses - ISNOG, 2012)