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Manzani, D., Montesso, M., Mathias, C. F., Venkata Krishanaiah, K., Ribeiro, S. J. L., & Nalin, M. (2016). Visible up-conversion and near-infrared luminescence of Er³⁺/Yb³⁺ co-doped SbPO₄-GeO₂ glasses. Optical Materials, 57, 71-78. External link