ElTahir, I., 		Babiker, H., 		Mukhtar, N., & 		Hamad, M.
(2010).
 Potentiality of some Sudanese Acacia species for nodulation and nitrogen fixation.
<em>Gezira Journal Of Agricultural Science, 8</em>(1).
Retrieved from <a href="http://journals.uofg.edu.sd/index.php/gjas/article/view/1022" target="_new">http://journals.uofg.edu.sd/index.php/gjas/article/view/1022</a>