Jatindra N. Bhakta and  Yukihiro Munekage,  Impregnation of Cupper into Kanuma Volcanic Ash Soil to Improve Mercury Sorption Capacity.   journal   = {International Journal of Chemical and Molecular Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2012, vol. 61(1). 10 - 14
    [viewed 16 April 2024]. Available from: https://publications.waset.org/pdf/12145.