@misc{atsushi-a,
  title = {Ab-initio phonon calculation for K4Nb11Al2O20F / I4/mmm (139) / materials id 557200},
  author = {Atsushi Togo},
  publisher = {NIMS},
  year = {},
  keywords = {Phonon, K4Nb11Al2O20F, I4/mmm (139)}
}