Ulbrich, H. H., S. Andrade, V. A. Janasi, and R. S. Cardenete. “QUALITY CONTROL OF ANALYTICAL ROUTINES FOR WHOLE-ROCK GEOCHEMISTRY: I: PARTICIPATION OF THE CHEMISTRY AND ICP-OES LABORATORY, INSTITUTE OF GEOSCIENCES, UNIVERSITY OF SÃO PAULO, IN THE INTERNATIONAL PROFICIENCY ROUNDS GEOPT 2, 3 AND 4”. Geochimica Brasiliensis 16, no. 2 (December 19, 2011). Accessed December 9, 2024. https://geobrasiliensis.org.br/geobrasiliensis/article/view/190.