@article{
  author = {Ghasemloo, M., Nikdel, N., Soltani, M. R., Firoozi, M., Soheilian, F.},
  title = {Thermal negativity in a two qubit XXX and XX spin chain model in an external magnetic field},
  journal = {Journal of Physical & Theoretical Chemistry},
  year = {2013},
  volume = {10},
  number = {2},
  pages = {143-149},
  doi = {}
}