M. B. Degen, Reneau, R. B., Hagedorn, C., and Martens, D. C.,
“Denitrification in onsite wastewater treatment and disposal systems”, vol. no. 171. Virginia Water Resources Research Center, Blacksburg, VA, USA, p. xii, 113 p. : fig., tab., 1991.
J. C. L. van Buren,
“Posttreatment methods for effluent of UASB reactors treating domestic water”. Agricultural University Wageningen, Wageningen, The Netherlands, p. 39 p. : fig., tab., 1991.
T. Ramjeawon,
“Water systems and water management on the island of Mauritius”, in
Population, economy, and environment in Mauritius : proceedings of a task force meeting held under the UNFPA sponsored project "Population and Sustainable Development: Mauritius" at IIASA, Laxenburg, Austria, 3-5 September 1990, 1991, pp. P. 271-291: 9 fig., 6 tab.