Ortiz-Zamora, G., Huerta-Díaz, M., Salas-de-León, D., & Monreal-Gómez, M. (2002). Degrees of pyritization in the Gulf of Mexico in sediments influenced by the Coatzacoalcos and the Grijava-Usumacinta rivers. Ciencias Marinas, 28(4), 369–379. https://doi.org/10.7773/cm.v28i4.238