@article{5455,
  author = {Peter Bender},
  title = {Proposed microwave transponders for early lunar robotic landers},
  year = {1994},
  journal = {Advances in Space Research},
  volume = {14},
  pages = {233-242},
  month = {Jan-06-1994},
  issn = {02731177},
  doi = {10.1016/0273-1177(94)90033-7},
}