Thakur, Ajay, et al. “Effect of Methods and Catalysts on the One-Pot Synthesis of Tetrahydropyridine Derivatives: A Mini-Review”. Orbital: The Electronic Journal of Chemistry, vol. 13, no. 4, Oct. 2021, pp. 335-49, https://periodicos.ufms.br/index.php/orbital/article/view/15581.