TY - JOUR PB - American Physical Society ID - 10.1103/Physics.3.55 TI - Keeping atoms synchronized for better timekeeping JF - Physics JA - Physics J1 - PHYSICS VL - 3 IS - SP - 55 EP - PY - 2010/07/06/ UR - http://link.aps.org/doi/10.1103/Physics.3.55 A1 - Gibble, Kurt ER -