@misc{indiciaedc89f3bf2834,
  title = {Beam builder for space fabrication},
  author = {Ehl, J. H. and Irvine, C. N. and Williams, J. R.},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19790059233},
  note = {Source identifier: 19790059233}
}