Mudya Yolanda, A. et al. 2019. Spline Regression on Percentage of Reflectance Based on Wavelength of Lithium Niobate (LiNbO3) Doped with Ruthenium Oxide (RuO2). International Journal of Sciences: Basic and Applied Research (IJSBAR). 47, 1 (Jul. 2019), 189–201.