Unitarity of time - like noncommutative gauge theories: The Violation of ward identities in time ordered perturbation theory

@article{Ohl2003UnitarityOT,
  title={Unitarity of time - like noncommutative gauge theories: The Violation of ward identities in time ordered perturbation theory},
  author={Thorsten Ohl and Reinhold Ruckl and J{\"o}rg Zeiner},
  journal={Nuclear Physics},
  year={2003},
  volume={676},
  pages={229-242}
}

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