1. Arambarri P, Cabrera F (1986) Vegetation waters as spreading agents of water contamination by heavy metals. In: International symposium on olive by-products valorisation, FAO, UNDP, Sevilla, Spain, 1986, pp 145–146
2. Bonari E, Ceccarini L (1990) Sugli effetti dello spargimento delle acque di vegetazione sul terreno agrario: risultati di una ricerca sperimentale. Genio Rurale 5:60–67
3. Brown K (1994) Fluids in deforming sediments, in the geological deformation of sediments. In: Maltman A (ed) Chapman & Hall, London, pp 239–244
4. Chui YC, Chang CN, Lin JG, Huang SJ (1997) Alkaline and ultrasonic pre-treatment of sludge before anaerobic digestion. Water Sci Technol 36:155–162
5. Cox L, Celis R, Hermosin MC, Becker A, Cornejo J (1997) Porosity and herbicide leaching in soils amended with olive mill waste water. Agric Ecosyst Environ 65:151–161