WASET
    S. Krustev and  V. Angelova and  P. Zaprjanova,  Selenium Content in Agricultural Soils and Wheat from the Balkan Peninsula.   journal   = {International Journal of Agricultural and Biosystems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2019, vol. 153(9). 229 - 232
    [viewed 10 May 2024]. Available from: https://publications.waset.org/pdf/10010784.