@misc{indiciae9cf1ec6b0e16,
  title = {Advanced space system concepts and their orbital support needs (1980 - 2000). Volume 1: Executive summary},
  author = {Bekey, I. and Mayer, H. L. and Wolfe, M. G.},
  year = {1976},
  url = {https://ntrs.nasa.gov/citations/19760023156},
  note = {Source identifier: 19760023156}
}