Hodaifa, G. , Páez, J. , Agabo, C. , Ramos, E. , Gutiérrez, J. , Rosal, A.. "Flocculation on the Treatment of Olive Oil Mill Wastewater: Pretreatment". World Academy of Science, Engineering and Technology, Open Science Index 101, International Journal of Chemical and Molecular Engineering (2015), 9(5), 645 - 650.