A. Ortuzar and  I. Escondrillas and  F. Mijangos,  Inorganic Anion Removal from Water Using Natural Adsorbents.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2018, vol. 135(3). 284 - 287
    [viewed 19 October 2019]. Available from: https://publications.waset.org/pdf/10009206.