@misc{indiciae7cca45b99407,
  title = {Systems comparison of direct and relay link data return modes for advanced planetary missions},
  author = {Barber, T. A. and Billy, J. M. and Bourke, R. D.},
  year = {1966},
  url = {https://ntrs.nasa.gov/citations/19660015224},
  note = {Source identifier: 19660015224}
}