Rahaman, Habibur. “Influence of Solvent and Oxidant in Copper-Catalyzed Synthesis of Xanthine Skeletons”. Asian Journal of Chemistry 34, no. 5 (April 20, 2022): 1310–1312. Accessed November 23, 2024. https://asianpubs.org/index.php/ajchem/article/view/34_5_38.