“Structural and Optical Studies of Ho\(^{3+}\) Yb\(^{3+}\) Co-Doped TiO\(^{2}\) Nanoparticles in Silica Glass”. 2016. Journal of Atomic, Molecular, Condensed Matter and Nano Physics 3 (2): 61-71. https://doi.org/10.26713/jamcnp.v3i2.462.