Muhammad A.Rauf and  I.Shehadeh and  Amal Ahmed and  Ahmed Al-Zamly,  Removal of Methylene Blue from Aqueous Solution by Using Gypsum as a Low Cost Adsorbent.   journal   = {International Journal of Chemical and Molecular Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2009, vol. 31(7). 369 - 374
    [viewed 27 November 2021]. Available from: