C. K. Lee y Yu, C. W.,
«Conservation of water resources : use of sea water for flushing in Hong Kong»,
Aqua : journal of water supply research and technology, pp. p. 202-209 : 3 fig., 2 tab., 1997.
D. A. Okun,
«Distributing reclaimed water through dual systems»,
Journal American Water Works Association, pp. p. 52-64 : 5 fig., 2 tab., photogr., 1997.