T. Ningnoi,
« Arsenic removal from groundwater by conditioned zeolite », vol. no. 081. IHE (International Institute for Infrastructural, Hydraulic and Environmental Engineering), Delft, The Netherlands, p. 54 p. : fig., tab., 1999.
T. K. Weldesemayat,
« Defluoridation of drinking water by conditioned zeolite », vol. no. 080. IHE (International Institute for Infrastructural, Hydraulic and Environmental Engineering), Delft, The Netherlands, p. vi, 37 p. + annexes (ca. 15 p.) : 25 fig., 5 tab., 1999.
K. Mathew, Pillai, J., Gibbs, R., et Ho, G. E.,
« H2S paper strip method : a bacteriological test for faecal coliforms in drinking water at various temperatures »,
Water science and technology, p. p. 85-90 : 2 fig., 2 tab., 1999.
S. A. Ferdausi,
« Study of low-cost arsenic mitigation technologies for application in rural Bangladesh », vol. no. 087. IHE (International Institute for Infrastructural, Hydraulic and Environmental Engineering), Delft, The Netherlands, p. x, 119 p. + annexes (ca. 45 p.) : 41 fig., 31 tab., 1999.
A. Z. M. Iftikhar Hussain,
« Test report of Arsen:X (TM) filter in removing arsenic from tubewell water ». Bangladesh, Ministry of Health and Family Welfare, Dhaka, Bangladesh, p. 20 p. : fig., photogr., 1999.