@misc{indiciaec815cfa15690,
  title = {Some requirements on lifting vehicles for manned Mars operations.},
  author = {Carlson, R. W. and Swenson, B. L. and Tindle, E. L.},
  year = {1966},
  url = {https://ntrs.nasa.gov/citations/19660045983},
  note = {Source identifier: 19660045983}
}