Rai, S. “Structural and Optical Studies of Ho\(^{3+}\)/Yb\(^{3+}\) Co-Doped TiO\(^{2}\) Nanoparticles in Silica Glass”. Journal of Atomic, Molecular, Condensed Matter and Nano Physics 3, no. 2 (July 30, 2016): 61–71. Accessed May 3, 2024. http://www.rgnpublications.com/journals/index.php/jamcnp/article/view/462.