Boudjema, A., Guettaia, S., & Brinis, N. (2019). STATISTICAL AND HYDROCHEMICAL CLASSIFICATION OF UNDERGROUND WATERS IN A MULTI-LAYER AQUIFER SYSTEM IN AN ARID ZONE :APPLICATION TO CHOTT EL GHARBI BASIN (EXTREME WEST OF ALGERIA). Journal of Fundamental and Applied Sciences, 11(2), 786–803. https://doi.org/10.4314/jfas.v11i2.16