WASET
    Marine Shavlakadze,  Study on the Use of Manganese-Containing Materials as a Micro Fertilizer Based on the Local Mineral Resources and Industrial Wastes in Hydroponic Systems.   journal   = {International Journal of Agricultural and Biosystems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2020, vol. 159(3). 38 - 41
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/10011136.