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Performance of waste stabilization ponds in Northeast Brazil, vol. no. 9. Leeds, UK: University of Leeds, Department of Civil Engineering, 1996, p. ix, 139 p. : fig., tab.
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Mara, D.D., Pearson, H.W., Silva, S.A., Oliveira, R. de, Oragui, J.I., and Cawley, L.R.,
Wastewater storage and treatment reservoirs in Northeast Brazil, vol. no. 12. Leeds, UK: University of Leeds, Department of Civil Engineering, 1996, p. viii, 34 p. : 7 fig., 21 tab.
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