@misc{indiciae1b161dbaf4d5,
  title = {In-space production of large space systems from extraterrestrial materials: A program implementation model},
  author = {Vontiesenhausen, G. F.},
  year = {1977},
  url = {https://ntrs.nasa.gov/citations/19780004169},
  note = {Source identifier: 19780004169}
}