@misc{atsushi-a,
  title = {Ab-initio phonon calculation for Na2Ca(SO4)2 / C2/c (15) / materials id 6397},
  author = {Atsushi Togo},
  publisher = {NIMS},
  year = {},
  keywords = {Phonon, Na2Ca(SO4)2, C2/c (15)}
}