@misc{112201,
  author = {S Wakid and Kathleen Roberts},
  title = {ISDN Conformance Testing, Layer 1--Physical Layer, Part 1--Basic Rate S/T Interface, User Side},
  year = {1991},
  month = {1991-09-01},
  publisher = {Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD},
  language = {en},
}