Merzah, Amel Salih, and Abdulrahman Saleh Ibrahim. 2015. “Preparation and Characterization of Y2O3, Sio2 Doped By Eu2O3 As Luminescent Ink”. Iraqi Journal of Chemical and Petroleum Engineering 16 (2): 45-52. https://doi.org/10.31699/IJCPE.2015.2.6.