Spatial variation of physicochemical parameters in a constructed wetland for wastewater treatment: An example of the use of the R programming language . UNED Res. J. [Internet]. 2021 Mar. 18 [cited 2026 Jul. 30];13(1):e3294. Available from: https://revistas.uned.ac.cr/index.php/cuadernos/article/view/3294