TY  - GEN
AU  - Risley, A S
C2  - , National Institute of Standards and Technology, Gaithersburg, MD
DA  - 1969-01-01 05:01:00
DO  - https://doi.org/10.6028/NBS.TN.399
LA  - en
PB  - , National Institute of Standards and Technology, Gaithersburg, MD
PY  - 1969
TI  - The physical basis of atomic frequency standards:
ER  -