TY - GEN AU - Petrina C. Potts C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 2013-09-01 04:09:00 DO - https://doi.org/10.6028/NIST.IR.1149-09 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 2013 TI - NIST Time and Frequency Bulletin: ER -