Zhang, H., X. Peng, and L. Yuan. 2012. “Regioselective Nitration of Aromatic Hydrocarbons With Bentonite Supported Metallic Nitrates in the Presence of Solid Acids Catalysts”. Asian Journal of Chemistry 24 (9):3927-28. https://asianpubs.org/index.php/ajchem/article/view/9501.