TY - GEN AU - Lichtfuss, Karen Hansen C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 2015-01-01 05:01:00 DO - https://doi.org/10.6028/NIST.IR.8044-09 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 2015 TI - NIST time and frequency bulletin: ER -