Reza Kiasat, Ali, Foad Kazemi, and Mehdi Fallah Mehrjardi. “Protection of Carbonyl Groups As 2,4-Dinitro-Phenylhydrazone Catalyzed by Silica Sulfuric Acid”. Asian Journal of Chemistry 18, no. 2 (March 30, 2010): 969–972. Accessed August 26, 2024. https://asianpubs.org/index.php/ajchem/article/view/21069.