@misc{indiciae7526034e9c48,
  title = {Self-replicating systems: A systems engineering approach},
  author = {Vontiesenhausen, G. and Darbro, W. A.},
  year = {1980},
  url = {https://ntrs.nasa.gov/citations/19800025701},
  note = {Source identifier: 19800025701}
}