1 J.M. Obrecht, R.J. Wild, M.. Antezza, L.. Pitaevskii, S.. Stringari, and E.A. Cornell, Physical Review Letters 98, (2007).
1 D.M. Harber, J.M. McGuirk, J.M. Obrecht, and E.A. Cornell, Journal of Low Temperature Physics 133, (2003).