TY - JOUR AU - O'Brian, Thomas AU - Johnson, Bettye AU - Sakuma, F C2 - Metrologia DA - 1996-01-01 LA - en M1 - 32 PB - Metrologia PY - 1996 TI - Direct Intercomparison of Copper and Gold Freezing Point Blackbody Primary Standards from NRLM and NIST ER -