Mohamad, Sufian, Arni Munira Markom, Norbaiti Sidik, Mukul Chandra Paul, and Sulaiman Wadi Harun. “Performance Comparison of Zirconia, Bismuth and Silica-Doped Erbium Fiber for Optical Amplification”. International Journal of Engineering & Technology 7, no. 4.22 (November 30, 2018): 94–96. Accessed May 3, 2024. https://sciencepubco.com/index.php/ijet/article/view/22197.