“Removal of Congo Red Dye from Aqueous Solutions using Steam Activated Pigmented Rice Husk Carbon as an Adsorbent: A Thermodynamic Study” (2011) Journal of International Academy of Physical Sciences, 15(6), pp. 487–495. Available at: http://www.iaps.org.in/journal/index.php/journaliaps/article/view/663 (Accessed: 23 October 2026).