TY - GEN AU - Deane B Judd C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1950-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.CIRC.478 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1950 TI - Circular of the Bureau of Standards no. 478::colorimetry ER -