WASET
    Rabindra Prasad Dhakal and  Tatsuya Oshima and  Yoshinari Baba,  Synthesis of Unconventional Materials Using Chitosan and Crown Ether for Selective Removal of Precious Metal Ions.   journal   = {International Journal of Chemical and Molecular Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2009, vol. 32(8). 388 - 392
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/9951.