Narasimham, Lakshmi, and Vasant Dnyandeo Barhate. “Physico-Chemical Characterization of Some Beta Blockers and Anti-Diabetic Drugs - Potentiometric and Spectrophotometric PKa Determination in Different Co-Solvents”. European Journal of Chemistry, vol. 2, no. 1, Mar. 2011, pp. 36-46, doi:10.5155/eurjchem.2.1.36-46.371.