@article{article9b9e66b8,
title   = {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},
author = {Ulbrich, H. and Andrade, Sandra and Janasi, Valdecir de Assis and Cardenete, Ricardo Silva},
year = {2002},
doi = {10.21715/gb.v16i2.190},
journal   = {Geochimica Brasiliensis}
}