A high phase-space density mixture of 87Rb and 133Cs: towards ultracold heteronuclear molecules H.W. Cho, D.J. McCarron, D. L. Jenkin, M. P. Köppinger and S. L. Cornish Eur. Phys. J. D, 65 1-2 (2011) 125-131 Published online: 27 April 2011 DOI: 10.1140/epjd/e2011-10716-1