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2. Study and development of a miniaturized Cesium tube;Thomann;ESTEC report 5967/84, Rider 1,1989
3. Frequency performances of a miniature optically pumped cesium beam frequency standard
4. Compact Cesium Beam Frequency Standard : Improvements of the Frequency Stability towards, the 10-12 τ-1/2 level;Guérandel,2002
5. R. Lutwak, D. Emmons, R.M. Garvey, and P. Vlitas, “Optically-Pumped Cesium Beam Frequency Standard for GPS-III”, www.datum.com