A cold atom clock in absence of gravity Ph. Laurent, P. Lemonde, E. Simon, G. Santarelli, A. Clairon, N. Dimarcq, P. Petit, C. Audoin and C. Salomon Eur. Phys. J. D, 3 3 (1998) 201-204 Published online: 12 July 2013 DOI: 10.1007/PL00021584