TY - CPAPER TI - Erbium and yterbium concentration dependence of thermal, mechanical and optical properties in low silica content calcium aluminosilicate glasses PY - 1999 AU - Sampaio, J. A. AU - Catunda, Tomaz AU - Gama, S. AU - Bento, A. C. AU - Miranda, L. C. AU - Baesso, Mauro Luciano T2 - Brazilian Symposium on Glasses and Related Materials J2 - Program and abstracts PP - Ouro Preto ER -