González V, Valle S, Nirchio M, et al. Evaluation of the risk of contamination by heavy metals (Hg and Pb) in marine sediments of Estero Huaylá, Puerto Bolívar, Ecuador. Rev. Inst. investig. Fac. minas metal cienc. geogr. 2018;21(41):75-82. doi:10.15381/iigeo.v21i41.14995