Morales G. Utilization of the sewage sludge as raw material for the production of pozzolana. Semin., Exact Tech. Scienc. [Internet]. 2004 Dec. 15 [cited 2026 May 3];18(4):39-45. Available from: https://www.ojs.uel.br/revistas/uel/index.php/semexatas/article/view/3050