TY - GEN AU - Yoshihiro Ohno C2 - Journal of Research (NIST JRES), National Institute of Standards and Technology, Gaithersburg, MD DA - 1997-05-01 LA - en M1 - 102 No. 3 PB - Journal of Research (NIST JRES), National Institute of Standards and Technology, Gaithersburg, MD PY - 1997 TI - Improved Photometric Standards and Calibration Procedures at NIST ER -