TY - GEN AU - Michael A Lombardi AU - Michael A Lombardi C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 2002-01-01 05:01:00 DO - https://doi.org/10.6028/NIST.SP.432e2002 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 2002 TI - NIST time and frequency services: ER -