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S. LASFAR, and I. MOUALLIF, and A. LATRACHM. CHERGUI, and A. CHOUKIR, and A. DIAB, (2014) Resistance of different materials used in sewers systems : polyvinyl chloride (PVC), polypropylene (PP), and High density polyethylene (HDPE), to sulfuric acid and sodium sulfate attack. International Journal Engineering Research and Applications, Vol. 4, Issue 2 2014, PP.670-678..