Cai, Yan-Hua, Ru-Fang Peng, Shi-Jin Chu, and Jing-Bo Yin. 2010. “Synthesis of Schiff Base Derived from P-Aminobenzoic Acid by Solvent-Free Reaction Using Jet Milling”. Asian Journal of Chemistry 22 (8):5835-40. https://asianpubs.org/index.php/ajchem/article/view/11780.