TY - GEN AU - Blair, Byron E C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1966-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.TN.341 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1966 TI - The long-term performance of two rubidium vapor frequency standards: ER -