RAZA, H., HUSSAIN, M. and ALIBHOY, K., 1998. Seasonal investigation of drinking water quality. IN: Pickford, J. (ed). Sanitation and water for all: Proceedings of the 24th WEDC International Conference, Islamabad, Pakistan, 31 August-4 September 1998, pp.357-360.
This is a conference paper. The title of this paper in the Contents for this conference is "The multi-stage pre-filtration in northern Pakistan".