Sudden death and robustness of quantum correlations in the weak- or strong-coupling regime J.S. Zhang, L. Chen, M. Abdel-Aty and A.X. Chen Eur. Phys. J. D, 66 1 (2012) 2 Published online: 06 January 2012 DOI: 10.1140/epjd/e2011-20148-6