Khan, A Rasteed, Faltim Uddin H, and S Zaka Ahmed. 2002. “ADSORPTION BEHAVIOUR OF CITRIC ACID FROM AQUEOUS SOLUTIONS ON ACTI­ VATED CHARCOAL”. Biological Sciences - PJSIR 45 (2):82-85. https://v2.pjsir.org/index.php/biological-sciences/article/view/1755.