@misc{atsushi-a,
  title = {Ab-initio phonon calculation for Na6Sn2S7 / C2/c (15) / materials id 4907},
  author = {Atsushi Togo},
  publisher = {NIMS},
  year = {},
  keywords = {Phonon, Na6Sn2S7, C2/c (15)}
}