Sherien H. Ahmed and  Osama S. Helaly and  Mohamed S. Abd El-Ghany,  Preliminary Study for Separation of Heavy Rare Earth Concentrates from Egyptian Crude Monazite.   journal   = {International Journal of Materials and Metallurgical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2014, vol. 92(8). 866 - 872
    [viewed 27 April 2024]. Available from: https://publications.waset.org/pdf/10000185.