Pump-probe spectroscopy of atoms cooled in a 3D lin⊥lin optical latticeF.-R. Carminati, M. Schiavoni, Y. Todorov, F. Renzoni and G. GrynbergEur. Phys. J. D, 22 3 (2003) 311-317DOI: https://doi.org/10.1140/epjd/e2002-00228-6