Corrales-Pérez, D., & Martín-Romero, F. (2018). Modifications to improve the application of method D3987-85 in the extraction of EPT from the abandoned mine tailings El Fraile, Guerrero, México. Revista Mexicana De Ciencias Geológicas, 35(1), 1–17. https://doi.org/10.22201/cgeo.20072902e.2018.1.536