@article{senn2015negative,
  title={Negative thermal expansion in hybrid improper ferroelectric Ruddlesden-Popper perovskites by symmetry trapping},
  author={Senn, Mark S and Bombardi, A and Murray, CA and Vecchini, C and Scherillo, A and Luo, X and Cheong, SW},
  journal={Physical review letters},
  volume={114},
  number={3},
  pages={035701},
  year={2015},
  url={https://doi.org/10.1103/PhysRevLett.114.035701},
  publisher={American Physical Society}
}

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