@article{143771,
  author = {John Burnett and Zachary Levine},
  title = {Intrinsic Birefringence in Calcium Fluoride and Barium Fluoride},
  year = {2001},
  number = {64},
  month = {2001-01-01},
  publisher = {Physical Review B (Condensed Matter and Materials Physics)},
  language = {en},
}