Hodby E., S.T. Thompson, C.A. Regal, M. Greiner, A. Wilson, D.S. Jin, E.A. Cornell, and C.E. Wieman, Physical Review Letters 94, 120402 (2005).
Claussen N.R., S. Kokkelmans, S.T. Thompson, E.A. Donley, E. Hodby, and C.E. Wieman, Physical Review A 67, (2003).