1. Agudelo JI, Hoekstra AY (2001), Valuing water for agriculture: application to the Zambezi Basin Countries, paper presented at Conference on ‘globalization and water resources management: the changing value of water’ AWRA/IWLRI, University of Dundee, International Specialty Conference, 6–8 August
2. Ahmad MD, Masih I, Turral H (2004a) Diagnostic analysis of spatial and temporal variations in crop water productivity: a field scale analysis of rice–wheat cropping system of Punjab, Pakistan. J Appl Irrig Sci 39(1):43–63
3. Ahmad MD, Masih I, Turral H (2004b) A comparative analysis of crop water productivity of rice–wheat and cotton-wheat rotations in Rechna Doab, Punjab, Pakistan. New directions for a diverse planet. In: 4th International Crop Science Congress, 26 Sep.–1 Oct. 2004, Brisbane, Australia
4. Ahmad MD, Bastiaanssen WGM, Feddes RA (2005) A new technique to estimate net groundwater use across large irrigated areas by combining remote sensing and water balance approaches, Rechna Doab, Pakistan. Hydrogeol J. http://www.springerlink.com/index/10.1007/s10040-004-0394-5 (online issue)
5. Bastiaanssen WGM, Ahmad MD, Tahir Z (2003) Upscaling water productivity in irrigated agriculture using remote-sensing and GIS technologies. In: Kijne JW, Barker R, Molden D (eds) Water productivity in agriculture: limits and opportunities for improvement. CABI, Wallingford, UK, pp 289–300