Mamatha, M. , Aravinda, H. , Puttaiah, E. , Manjappa, S. (2012). 'Adsorption of Ferrous and Ferric Ions in Aqueous and Industrial Effluent onto Pongamia pinnata Tree Bark'. World Academy of Science, Engineering and Technology, Open Science Index 67, International Journal of Chemical and Molecular Engineering, 6(7), 645 - 653.