Bamuaafa م. س. س., Fadel ر. م. ع., & 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), 217–224. https://doi.org/10.47372/uajnas.2017.n2.a01