Corrales-Pérez, Daniel, and Francisco Martín-Romero. “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, vol. 35, no. 1, Mar. 2018, pp. 1-17, doi:10.22201/cgeo.20072902e.2018.1.536.