2023. Determining the Ionization Constants of Some Schiff Bases Derived from Vanillin and Aniline and Its Substitutes by Spectrometric Titration Method. (Hammett Relation Application). College of Basic Education Research Journal. 19, 1 (Mar. 2023), 844–860. DOI:https://doi.org/10.33899/berj.2023.178143.