“SYNTHESIS OF NANO YTRRIUM OXIDE PHOSPHORS BY SIMPLE METHODS AND THEIR MORPHOLOGICAL STUDIES”. INTERNATIONAL JOURNAL OF PHYSICS RESEARCH AND DEVELOPMENT (IJPRD), vol. 2, no. 1, Apr. 2019, pp. 26-34, https://iaeme-library.com/index.php/IJPRD/article/view/IJPRD_01_01_004.