M. Mamatha and  H. B. Aravinda and  E. T. Puttaiah and  S. Manjappa,  Adsorption of Ferrous and Ferric Ions in Aqueous and Industrial Effluent onto Pongamia pinnata Tree Bark.   journal   = {International Journal of Chemical and Molecular Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2012, vol. 67(7). 645 - 653
    [viewed 06 December 2021]. Available from: https://publications.waset.org/pdf/16906.