1. Ahmad, Z., & Khawaja, A. A. (1999). Three-dimension flow and solute transport modeling of the Eolian Aquifer in a uniform flow field of a chemical plant. Pakistan Journal of Hydrocarbon Research, 11, 59–74.
2. Ahmad, Z., & Serrano, S. (2001). Numerical groundwater flow modeling of the Rechna Doab Aquifer, Punjab, Pakistan. In Proceeding of international groundwater modeling conference (IGWMC). MODFLOW 2001 and other Modeling Odysseys, Colorado School of Mines and Geophysics, Denver, USA, 12–14 September.
3. Ahmad, Z., Ahmad, I., & Gulraiz, A. (1994). A report on groundwater reserve estimation of the Ahmad Khan well field and its safe utilization for the 4000 TPD Luck Cement plant Pezu, D.I. Khan.
4. Ahmad, Z., Ashraf, M., & Siddiqui, R. F. (1997a). Groundwater computer modeling of the National Park area in the vicinity of Rawal Lake, Islamabad. Journal of Drainage and water Management, 1, 8–21.
5. Ahmad, Z., Shaista, M., & Gulraiz, A. (1997b). Evaluation of groundwater potential of Islamabad area using logs data of test holes drilled by OGDC. Pakistan Journal of Hydrocarbon Research, 9, 91–101.