Turan Çalban and  Nursel Keskin and  Sabri Çolak and  Soner Kuşlu,  Investigation of Dissolution in Diammonium Hydrogen Phosphate Solutions of Gypsum.   journal   = {International Journal of Chemical and Molecular Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2015, vol. 100(4). 367 - 370
    [viewed 04 August 2020]. Available from: https://publications.waset.org/pdf/10001139.