@misc{indiciae8b9fcb63be0e,
  title = {Designers' unified cost model},
  author = {Freeman, W. and Ilcewicz, L. and Swanson, G. and Gutowski, T.},
  year = {1992},
  url = {https://ntrs.nasa.gov/citations/19950022043},
  note = {Source identifier: 19950022043}
}