@misc{indiciae3573a4e11b55,
  title = {Conservation of design knowledge},
  author = {Sivard, Cecilia and Zweben, Monte and Cannon, David and Lakin, Fred and Leifer, Larry},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19890037790},
  note = {Source identifier: 19890037790}
}