Saad M. Howladar and  Mostafa M. Rady and  Ashraf Sh. Osman,  Effect of Bio-Nitrogen as a Partial Alternative to Mineral-Nitrogen Fertiliser on Growth, Nitrate and Nitrite Contents, and Yield Quality in Brassica oleracea L..   journal   = {International Journal of Agricultural and Biosystems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2013, vol. 79(7). 578 - 583
    [viewed 11 May 2024]. Available from: https://publications.waset.org/pdf/16334.