9Abate Tedla, Tekalign Mamo, Klaij M C. The performance of wheat and wheat/clover intercropping on drained vertisol in the ethiopian highlands. Addis Adeba (Ethiopia), 1998.55-61.
10Kingsley K Ayisi, Daniel H, et al. Strip intercropping and nitrogen effects on seed, oil, and protein yeilds of canola and soybean. Agronomy Journal, 1997, 89: 23-29.
