TY - ICOMM AU - Parr, Albert AU - Wiersma, G C1 - http://physics.nist.gov/tn1421 C2 - http://physics.nist.gov/tn1421 DA - 2000-01-01 LA - en PB - http://physics.nist.gov/tn1421 PY - 2000 TI - A National Measurement System for Radiometry, Photometry, and Pyrometry Based upon Absolute Detectors ER -