Astonitas Carrasco, L. J., E. Pariente Mondragón, and M. E. Milla Pino. “Evaluation of the Content of Heavy Metals in Periurban Soils from Physicochemical Parameters”. Journal of the University of Zulia , Vol. 12, no. 33, May 2021, pp. 50-69, doi:10.46925//rdluz.33.05.