@misc{1187646,
  author = {Christoph Witzgall},
  title = {Mathematical methods of site selection for electronic message systems (EMS):},
  year = {1975},
  month = {1975-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.IR.75-737},
  language = {en},
}