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2. Efficient use of limited water resources: Making Israel a Model State, BESA Books,2001
3. Water Recycling 2030 — Recommendations of California’s Recycled Water Task Force, Sacramento, CA;Department of Water Resources,2003
4. Geonardo, Project partner in AQUAREC, www.-geonardo.hu.
5. Ministerio de Medio Ambiente, Libro Blanco del Agua en Espana, Madrid, 2000.