@misc{indiciae7c94a4bba387,
  title = {Concept for a lunar He-3 transporter using an in-orbit modified shuttle external tank},
  author = {Butterfield, A. J. and Goslee, J. W.},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19900037753},
  note = {Source identifier: 19900037753}
}