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1. Introduction; 2. Atomic frequency standards: principle of operation and characterization of their performance; 3. Caesium clocks, classical and optically pumped; 3.1. Caesium clocks with magnetic selection; 3.2. Caesium AFS with optical pumping; 3.3. Systematic frequency offsets; 3.4. Development of the accuracy with time; 3.5. Commercial caesium clocks; 4. More accurate, more complex; 4.1. Primary clocks; 4.2. Atomic fountains; 4.3. Optical clocks; 5. A survey on other AFS in practical use; 5.1. General remarks; 5.2. The hydrogen maser; 5.3. Rubidium gas cell frequency standards; 5.4. Current trend in gas cell AFS; 6. Applications; 6.1. A short note on the realization of TAI; 6.2. Timing aspects of the future European satellite navigation system Galileo; 6.3. Synchronization of the networks for electrical power distribution; 6.4. The search for the variability of the fundamental constants; 7. Conclusion; 8. Disclaimer
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