TY - JOUR AU - Guenther, Franklin AU - Milton, M AU - Miller, Walter AU - Brown, A C2 - Metrologia DA - 2006-11-01 LA - en M1 - 43 PB - Metrologia PY - 2006 TI - Validation of the Gravimetric Values and Uncertainties of Independently Prepared Primary Standard Gas Mixtures ER -