Apellaniz, Iagoba; Luecke, Bernd; Peise, Jan; Klempt, Carsten; Toth, Geza: Detecting metrologically useful entanglement in the vicinity of Dicke states. In: New Journal of Physics 17 (2015), 83027. DOI:
http://dx.doi.org/10.1088/1367-2630/17/8/083027