Lozano, Rufino, and Juan Pablo Bernal. 2018. “Characterization of a New Set of Eight Geochemical Reference Materials for XRF Major and Trace Element Analysis”. Revista Mexicana De Ciencias Geológicas 22 (3):329-44. https://rmcg.geociencias.unam.mx/index.php/rmcg/article/view/841.