Experimental study of Velocity Changing Collisions on Coherent Population Trapping in sodiumS. Gozzini, P. Sartini, C. Gabbanini, A. Lucchesini, C. Marinelli, L. Moi, J. H. Xu and G. AlzettaEur. Phys. J. D, 6 1 (1999) 127-131DOI: https://doi.org/10.1007/s100530050292