1. Strategic importance of green water in international crop trade;Aldaya,2008
2. ‘Virtual water’: a long term solution for water short Middle Eastern economies?;Allan,1997
3. Water stress and global mitigation: water food and trade;Allan,1999
4. Virtual water, part of an invisible synergy that ameliorates water scarcity;Allan,2006
5. Crop evapotranspiration – guidelines for computing crop water requirements – FAO irrigation and drainage paper 56;Allen,1998