@misc{atsushi-a,
  title = {Ab-initio phonon calculation for Na4TiP2O9 / P2/c (13) / materials id 680756},
  author = {Atsushi Togo},
  publisher = {NIMS},
  year = {},
  keywords = {Phonon, Na4TiP2O9, P2/c (13)}
}