Djafari , D. “Rheology Serving the Environment to Characterize Sludge from Wastewater Treatment Plants (WWTPs)”. Algerian Journal of Renewable Energy and Sustainable Development, Vol. 2, no. 02, Dec. 2020, pp. 151-6, https://ajresd.univ-adrar.edu.dz/index.php?journal=AJRESD&page=article&op=view&path[]=94.