6Huddleston B. FAO'S overall approach and methodology for forum 2. Mulating national food security programs in developing countries [J]. IDS Bull, 1990, 21 (3): 72～80
7Kennes W. The European community and food security [J]. IDS Bull, 1990, 21(3): 67～71
8Shaw D J, Clay E J. Global hunger and food security after the World Food Summit [J]. Dev. Studies,1998, (19):56～76
9Wichelns D. The role of virtual water, in efforts to achieve food security and other national goals with an example from Egypt [J]. Agricultural water management, 2001, (49): 131～151
