1. The On-board Galileo Clocks: Rubidium Standard and Passive Hydrogen Maser –Current Status and Performance-;Droz,2006
2. Standard for GPS-III Optically-pumped cesium beam frequency;Lutwak,2001
3. Performance demonstration of a compact, single optical frequency Cesium beam clock for space applications
4. Comparison of pumping a cesium beam tube withD1andD2lines
5. Cesium D Line Data;Steck,2010