@misc{atsushi-a,
  title = {Ab-initio phonon calculation for Ca2Nb2O7 / Pna2_1 (33) / materials id 560040},
  author = {Atsushi Togo},
  publisher = {NIMS},
  year = {},
  keywords = {Phonon, Ca2Nb2O7, Pna2_1 (33)}
}