PROFIT MAXIMIZATION AT WASTEWATER TREATMENT PLANTS. THE CASE OF VALENCIA (SPAIN) (Article published in Spanish). estud.gerenc. [Internet]. 2011 Sep. 30 [cited 2026 Oct. 21];120(27):147-64. Available from: https://www2.icesi.edu.co/revistas/index.php/estudios_gerenciales/article/view/1111