1. pKa Prediction for Organic Acids and Bases;Perrin,1981
2. CompuDrug NA, Inc. pKalc Version 3.1, (1996).
3. ACD Inc. ACD/pKa Version 1.0, (1997).
4. Estimation of Chemical Reactivity Parameters and Physical Properties of Organic Molecules using SPARC;Hilal,1994