TY - GEN AU - Potts, Petrina C. C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 2014-04-01 04:04:00 DO - https://doi.org/10.6028/NIST.IR.7980-03 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 2014 TI - NIST Time and Frequency Bulletin: ER -