Ashraf, Muhammad Awais, Waqar Ali Khan, Muhammad Zia ul Haq, Shah Muhammad, Khurram Shahzad, and Javaid Rabbani Khan. 2014. “Regeneration of Anionic Exchange Resin Used in Hexavalent Chromate Removal”. Journal of the Pakistan Institute of Chemical Engineers 42 (2):119-24. http://piche.org.pk/journal/index.php/jpiche/article/view/154.