Das Sarma, Madhushree, and Subhojit Ghosh. “Recent Advances in Catalysis of Hantzsch and Related Synthesis of 1,4-Dihydropyridines and Polyhydroquinolines: A Brief Overview”. Asian Journal of Chemistry 32, no. 12 (December 7, 2020): 2943–2952. Accessed April 20, 2024. https://asianpubs.org/index.php/ajchem/article/view/32_12_1.