Dogra, D., R. Bharti, and R. Sharma. “Citric Acid Catalyzed Aqua Mediated Multicomponent Synthesis of Tetrahydropyridines and Its Antioxidant Activities”. Orbital: The Electronic Journal of Chemistry, Vol. 12, no. 4, Dec. 2020, pp. 232-41, https://periodicos.ufms.br/index.php/orbital/article/view/15720.