@article{johnston2005first,
  title={First-principles study of symmetry lowering and polarization in Ba Ti O 3/ Sr Ti O 3 superlattices with in-plane expansion},
  author={Johnston, Karen and Huang, Xiangyang and Neaton, Jeffrey B and Rabe, Karin M},
  journal={Physical Review B},
  volume={71},
  number={10},
  pages={100103},
  year={2005},
  publisher={American Physical Society}
}

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