Siti Nurbaya Supardan, et al. “Morphological, Structural and Optical Properties of Er3+-Doped SiO2-TiO2 Nanofiber”. International Journal of Nanoelectronics and Materials (IJNeaM) , vol. 17, no. 1, Feb. 2024, pp. 92-97, doi:10.58915/ijneam.v17i1.479.