@misc{indiciae7c4896da7fdb,
  title = {Universal Index System},
  author = {Kelley, Steve and Roussopoulos, Nick and Sellis, Timos and Wallace, Sarah},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19930012963},
  note = {Source identifier: 19930012963}
}