Calmus, T.; Valencia-Moreno, M.; Del Río-Salas, R.; Ochoa-Landín, L.; Mendivil-Quijada, H. A Multi-Elemental Study to Establish the Natural Background and Geochemical Anomalies in Rocks from the Sonora River Upper Basin, NW Mexico. revmexcg 2018, 35, 158-167.