@misc{indiciae3ec3ed963424,
  title = {Preliminary concept for lunar exploration tracking and data acquisition and data processing systems},
  author = {Hei, Donald, Jr. and Shapiro, Phillip S. and Messing, Frederic and Jacobsen, Alan and Bruno, Ronald},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19900026508},
  note = {Source identifier: 19900026508}
}