1. Standard Methods for the Examination of Water and Wastewater;APHA,1980
2. Biological Process Design for Wastewater Treatment;Benefield,1980
3. The use of wastewater for agricultural irrigation;Noy,1977
4. Potentiometric determination of soil organic matter;Raveh,1972
5. Total nitrogen analysis in water, soil and plant material with a persulphate oxidation;Raveh;Water Res.,1979