QIN, Xin-Ying; JIN, Tong-Shou; ZHOU, Zun-Xia; LI, Tong-Shuang. Silica Sulfuric Acid: An Efficient and Versatile Catalyst for One-Pot Synthesis of Substituted 5-Oxo-1,4,5,6,7,8-hexahydroquinoline Derivatives. Asian Journal of Chemistry, [S. l.], v. 22, n. 2, p. 1179–1182, 2010. Disponível em: https://asianpubs.org/index.php/ajchem/article/view/11247. Acesso em: 1 jul. 2024.