@misc{IshigamaBeckerMartinetal.1972,
  author    = {M. Ishigama and Charles R. Becker and T. P. Martin and W. Prettl},
  title     = {Impurity-pair mode in NaCl:KF},
  institution = {Physikalisches Institut},
  type      = {review},
  year        = {1972},
}