Srinivasan, S., M. Sundarrajan, and I. Ameethbasha. 2016. “1H NMR Chemical Shift Correlations and Thermodynamic Functions of Methyl-4-Acetoxybenzothiophene-6-Carboxylate and 4-Hydroxybenzothiophene-6-Carboxylic Acid”. Asian Journal of Chemistry 17 (3):1813-17. https://asianpubs.org/index.php/ajchem/article/view/14028.