"Above and Below Ground Competition for Resources in a Sesbania and Maize Agroforestry System" (2025) University of Khartoum Journal of Agricultural Sciences, 17(2). موجود في: https://onlinejournals.uofk.edu/uofkjas/article/view/1957 (تاريخ الوصول: 25 مايو 2026).