G, Umamaheswar, et al. “Spectroscopic Properties of Yb3+ Nd3+ Co-Doped Ions in SiO2-Al2O3-Na2CO3-SrF2-CaF2 Oxyfluoride Glasses for Photonic Applications”. Photonics Letters of Poland, vol. 10, no. 1, Mar. 2018, pp. 29-31, doi:10.4302/plp.v10i1.799.