Feshbach resonances in 23Na–87Rb M. Bhattacharya, L. O. Baksmaty, S. B. Weiss and N. P. Bigelow Eur. Phys. J. D, 31 2 (2004) 301-306 Published online: 23 November 2004 DOI: 10.1140/epjd/e2004-00164-5