1 P.G. Westergaard, R.. Christensen, D.A. Tieri, R.. Matin, J.. Cooper, M.J. Holland, J.. Ye, and J.W. Thomsen, Physical Review Letters 114, (2015).
1 D.A. Tieri, J.. Cooper, B.T.R. Christensen, J.W. Thomsen, and M.J. Holland, Physical Review A 92, (2015).
1 J.E. Williams, R.. Walser, J.. Cooper, E.A. Cornell, and M.J. Holland, Physical Review A 61, (2000).