Willemite-Based Glass Ceramic Doped by Different Percentage of Erbium Oxide and Sintered in Temperature of 500-1100C Physical and Optical Properties - Sarrigani, Gholamreza Vahedi; Sarrigani, Gholamreza Vahedi; Amiri, Iraj Sadegh (Springer International Publishing : Imprint: Springer, 2019)