D. Naik, Bhanvesh, and K.R. Desai. “Synthesis of Some Heterocyclic Schiff Base and Azetidinone Compounds and Their Antibacterial Activity”. Asian Journal of Chemistry, vol. 16, no. 3, June 2016, pp. 1749-52, https://asianpubs.org/index.php/ajchem/article/view/14414.