International agricultural trade : implications on Ethiopian agricultural exports : proceedings of the 5th Annual Conference of the Agricultural Economics Society of Ethiopia, 22-23 December 2000Workneh Negatu,Legesse Dadi, Abebe Haile Gabrielmag(2001)引用 20|浏览7暂无评分AI 理解论文溯源树样例生成溯源树,研究论文发展脉络