00672nam a2200217Ia 4500 CTU_101236 210402s9999 xx 000 0 und d 37000 338.181 N104 Nguyễn, Văn Nam Sàn giao dịch nông sản với việc giảm rủi ro về giá cả : Sách chuyên khảo Nguyễn Văn Nam Hà Nội Thống kê 2005 Developing countries,Agriculture Agriculturral aspects,Economic aspects Minh Trung tâm Học liệu Trường Đại học Cần Thơ