@misc{indiciae09498fe574e3,
  title = {Coupling relations in product and systems development},
  author = {Barth, R. T. and Douds, C. F. and Rubenstein, A. H.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19700044708},
  note = {Source identifier: 19700044708}
}