Entanglement perturbation theory for the elementary excitation in one dimension

@article{Chung2009EntanglementPT,
  title={Entanglement perturbation theory for the elementary excitation in one dimension},
  author={Sunggi Chung and Lihua Wang},
  journal={Physics Letters A},
  year={2009},
  volume={373},
  pages={2277-2280}
}
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