@misc{atsushi-a,
  title = {Ab-initio phonon calculation for NaSn4(PO4)3 / R3c (161) / materials id 6226},
  author = {Atsushi Togo},
  publisher = {NIMS},
  year = {},
  keywords = {Phonon, NaSn4(PO4)3, R3c (161)}
}