SURAJ B. ADE, et al. “Synthesis, Characterization And Biological Activity Of A Schiff Base Derived From Isatin And 2-Amino, 4-Methyl Phenol And Its Transition Metal Complexes”. International Journal of Pharma and Bio Sciences, vol. 3, no. 2, June 2012, pp. 350-6, https://ijpbs.net/index.php/journal/article/view/1396.