Nguyen Thi Kim Dzung and  Pham Ngoc Khai and  Rainer Ludwig,  Quantitative Determination of Trace Elements in Some Oriental Herb Products.   journal   = {International Journal of Agricultural and Biosystems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2010, vol. 41(5). 303 - 306
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/6622.