D. Allan, Statistics of atomic frequency standards, Proceedings of the IEEE, vol.54, issue.2, pp.221-230, 1966.
DOI : 10.1109/PROC.1966.4634

I. Fratter, J. Léger, F. Bertrand, T. Jager, G. Hulot et al., Swarm absolute scalar magnetometers first in-orbit results. Astronautica, Acta, in review Swarm: a constellation to study the Earth's magnetic field, Earth Planets Space, vol.58, pp.351-358, 2006.

O. Gravrand, A. Khokhlov, L. Mouël, J. Léger, and J. , On the calibration of a vectorial 4He pumped magnetometer, Earth, Planets and Space, vol.6, issue.N10, pp.949-958, 2001.
DOI : 10.1186/BF03351692

C. Guttin, J. Léger, and F. Stoeckel, An isotropic earth field scalar magnetometer using optically pumped helium 4, Le Journal de Physique IV, vol.04, issue.C4, pp.655-659, 1994.
DOI : 10.1051/jp4:19944174
URL : https://hal.archives-ouvertes.fr/jpa-00252632

G. Hulot, P. Vigneron, J. Léger, I. Fratter, N. Olsen et al., Cattin V (2015) Swarm's absolute magnetometer experimental vector mode, an innovative capability for space magnetometry, Geophys. Res. Lett, vol.42, p.10, 1002.

T. Jager, J. Léger, F. Bertrand, I. Fratter, and J. Lalaurie, SWARM Absolute Scalar Magnetometer accuracy: Analyses and measurement results, 2010 IEEE Sensors, pp.2392-2395, 2010.
DOI : 10.1109/ICSENS.2010.5690960

N. Kernevez, D. Duret, M. Moussavi, and J. Léger, Weak field NMR and ESR spectrometers and magnetometers, IEEE Transactions on Magnetics, vol.28, issue.5, pp.3054-3059, 1992.
DOI : 10.1109/20.179715

J. Léger, F. Bertrand, T. Jager, M. Prado, I. Fratter et al., Swarm Absolute Scalar and Vector Magnetometer Based on Helium 4 Optical Pumping, Procedia Chemistry, vol.1, issue.1, pp.634-637, 2009.
DOI : 10.1016/j.proche.2009.07.158

J. Léger, F. Bertrand, T. Jager, and I. Fratter, Spaceborn scalar magnetometers for Earth's field studies, Proceedings of the 62nd International Astronautical Congress, pp.11-12, 2011.

E. Thébault, C. Finlay, C. Beggan, P. Alken, A. J. Barrois et al., International Geomagnetic Reference Field: the twelfth generation. Space, Earth Planet, Earth Planet, 2015.