@misc{indiciaef7ed88a462c6,
  title = {Strategies for a permanent lunar base},
  author = {Duke, Michael B. and Mendell, Wendell W. and Roberts, Barney B.},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19910030105},
  note = {Source identifier: 19910030105}
}