From regularity to chaos: a direct experimental test using atoms in magnetic field N. Bouloufa, P. Cacciani, D. Delande, C. Delsart, J.C. Gay, E. Luc-Koenig et J. Pinard J. Phys. II France, 2 4 (1992) 671-681 DOI: 10.1051/jp2:1992158