New fluoro-aluminophosphate glasses doped with Er3+ and Yb3+: structural and Optical Characterization - Gonçalves, Tássia de Souza; Moreira, Raphaell; Eckert, Hellmut; de Camargo, Andrea Simone Stucchi (Encontro Nacional de Física da Matéria Condensada, 2014)