Blatt S., J.W. Thomsen, G.K. Campbell, A.D. Ludlow, M.D. Swallows, M. Martin, M.M. Boyd, and J. Ye, Physical Review A 80, (2009).
Ludlow A.D., S. Blatt, M.M. Boyd, G.K. Campbell, S.M. Foreman, M. Martin, M.H.G. de Miranda, T. Zelevinsky, J. Ye, T.M. Foetier, and J.E. Stalnaker, in Unknown (World Scientific Publishing Co. Pte. Ltd., Telluride, Colorado, Usasingapore, 2008).