K.K. EL-LOUH, A., M. ABUNADA, N., M. EL-ABBADY, S., & EL-SHOUBAKI, M. (2010). Synthesis of Dihydropyridine, Alkylthiopyridine, Thienopyridine and Pyridothienopyrimidine Derivatives. Asian Journal of Chemistry, 19(2), 1283–1292. Retrieved from https://asianpubs.org/index.php/ajchem/article/view/20244