@misc{indiciaef1a8f5b2ef15,
  title = {Helical recorder},
  author = {Cole, P. T. and Studer, P. A. and Tyler, A. L.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690000339},
  note = {Source identifier: 19690000339}
}