@misc{indiciae3b3a148e5b1c,
  title = {Cooperative answers in database systems},
  author = {Gaasterland, Terry and Godfrey, Parke and Minker, Jack and Novik, Lev},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19930022964},
  note = {Source identifier: 19930022964}
}