Hardik P. Gamdha, Dr. Dipak S. Vyas, and Sejal M. Patel. “Removal of Refractory COD from Pharmaceutical Wastewater Using HCO3 - and Fenton Oxidation Process”. International Journal of Advance Research in Engineering, Science & Technology, vol. 2, no. 5, May 2015, pp. 211-5, https://ijarest.org/index.php/ijarest/article/view/151.