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Wilhelm, B.; Romano, V.; Weber, H. P. (2004). Reduction of Eu3 + to Eu2 + in Al-Codoped Silica Glasses Fabricated by the Sol-Gel Technique and CO2-Laser Processing. Journal of sol-gel science and technology, 32(1-3), pp. 259-262. Kluwer Academic Publishers 10.1007/s10971-004-5798-0
