@misc{200201,
  author = {B. Danielson and C. Whittenberg},
  title = {Group index and time delay measurements of a standard reference fiber},
  year = {1988},
  month = {1988-07-01},
  publisher = {NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.IR.88-3091},
  language = {en},
}