Bamuaafa م. س. س., Fadel ر. م. ع. and Al-Koor ب. ع. س. (2017) “Effect of some intercropping systems cowpea with maize on land equivalent ratio”, University of Aden Journal of Natural and Applied Sciences, 21(2), pp. 217–224. doi: 10.47372/uajnas.2017.n2.a01.