The First Key Comparison of Primary Standard Gas Mixture of the Brazilian National Metrology InstituteA.L. Fioravante, C. R. Augusto, E.C.S. Elias, M.C. Brum, D.C.G.S. Teixeira, C.C. Ribeiro, R.J. Oudwater, F.A. Fagundes, M.C. da Silva and R.G. ReisInternational Congress of Metrology, (2013) 10006DOI: https://doi.org/10.1051/metrology/201310006