Violina R. Angelova,  Assessment of Soil Contamination on the Content of Macro and Microelements and the Quality of Grass Pea Seeds (Lathyrus sativus L.).   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2019, vol. 155(11). 651 - 658
    [viewed 12 December 2019]. Available from: https://publications.waset.org/pdf/10010890.