Optical and structural spectroscopic characteristics of fluorophosphate glasses singly- and co-doped with Er3+ and Yb3+ - Gonçalves, T. S.; Moreira, R. J.; Ferrari, C. R.; Eckert, Hellmut; de Camargo, Andrea Simone Stucchi (Brazilian Symposium on Glass and Related Materials - BraSGlass, 2014)