Nasreen, Aayesha. “Cupric Nitrate Catalyzed Efficient and Facile Synthesis of 1,8-Dioxo-Octahydroxanthene Derivatives”. Asian Journal of Chemistry 25, no. 13 (July 22, 2013): 7535–7538. Accessed July 23, 2024. https://asianpubs.org/index.php/ajchem/article/view/25_14_103.