@article{Bartkowiak:2011,
  author  = "M. Bartkowiak and A. Miranowicz and X. Wang and Y. Liu and W. Leoński and F. Nori",
  title   = "Sudden vanishing and reappearance of nonclassical effects: general occurrence of finite-time decays and periodic vanishings of nonclassicality and entanglement witnesses",
  journal = "Physical Review A",
  volume  = "Vol. 83",
  number  = "no 5",
  pages   = "053814-1--053814-9",
  year    = "2011",
}