Abdoelmoniem A. Attaelmanan and  Ahmed A. H. Siddig,  The Effect of Multiple Environmental Conditions on Acacia Senegal Seedling’s Carbon, Nitrogen, and Hydrogen Contents: An Experimental Investigation.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2023, vol. 194(2). 23 - 27
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/10012959.