Amira Shakila Razali and  Faridah Lisa Supian and  Muhammad Mat Salleh and  Suraini Abu Bakar,  Characterization and Detection of Cadmium Ion Using Modification Calixarene with Multiwalled Carbon Nanotubes .   journal   = {International Journal of Chemical and Molecular Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2015, vol. 98(2). 304 - 307
    [viewed 14 November 2019]. Available from: https://publications.waset.org/pdf/10000527.