Entanglement dynamics of three-qubit states under an XY spin-chain environment X. S. Ma, H. S. Cong, J. Y. Zhang and A. M. Wang Eur. Phys. J. D, 48 2 (2008) 285-292 Published online: 30 May 2008 DOI: 10.1140/epjd/e2008-00100-9