R. Shaw et Smith, M.,
« Desalination »,
Waterlines, an international journal of water, sanitation and waste, vol. no. 40, p. p. 15-18: 6 fig., 1994.
B. F. Sule et Olu, O. E. A.,
« Impact of Ilorin water supply extension on the Asa River catchment »,
Aqua : journal of water supply research and technology, p. p. 246-251: 11 ref., 1994.
G. Bocco, de Brouwer, H., et Karanga, F.,
« Modelling water resources and water demand in semi-arid areas : data integration and analysis using a geographic information system : a case study in Samburu District, northwestern Kenya, using .. (ILWIS) », vol. no. 2. UNESCO International Hydrological Programme, UNESCO-IHP, Paris, France, p. iv, 62 p. : fig., maps, tab., 1994.