@misc{atsushi-a,
  title = {Ab-initio phonon calculation for Ca2Nb2O7 / Fd-3m (227) / materials id 4155},
  author = {Atsushi Togo},
  publisher = {NIMS},
  year = {},
  keywords = {Phonon, Ca2Nb2O7, Fd-3m (227)}
}