Nguyen Cao Nguyen and  Krasimir I. Ivanov and  Penka S. Zapryanova,  Impact of Foliar Application of Zinc on Micro and Macro Elements Distribution in Phyllanthus amarus.   journal   = {International Journal of Agricultural and Biosystems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2019, vol. 151(7). 193 - 198
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