A cold atom clock in absence of gravityPh. Laurent, P. Lemonde, E. Simon, G. Santarelli, A. Clairon, N. Dimarcq, P. Petit, C. Audoin and C. SalomonEur. Phys. J. D, 3 3 (1998) 201-204DOI: https://doi.org/10.1007/PL00021584