WASET
    A. Boveiri Monji and  H. Yousefnia and  M. Haji Hosseini and  S. Zolghadri,  A Green Method for Selective Spectrophotometric Determination of Hafnium(IV) with Aqueous Extract of Ficus carica Tree Leaves.   journal   = {International Journal of Chemical and Molecular Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2018, vol. 135(3). 149 - 152
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/10008698.