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@MISC{Berberich2013,
  author = {Hubert Berberich},
  title = {Cipher disc for substitution cipher, manufacturer: Linge, Pleidelsheim
	(Germany)},
  howpublished = {Wikimedia},
  year = {2013},
  note = {License: Public Domain, Accessed: 2020-05-02},
  owner = {ple},
  timestamp = {2020.05.02},
  url = {https://en.wikipedia.org/wiki/File:CipherDisk2000.jpg}
}

@INPROCEEDINGS{friis1946,
  author = {Harald Trap Friis},
  title = {A Note on a Simple Transmission Formula},
  booktitle = {IRE Proc.},
  year = {1946},
  pages = {254 -- 256},
  month = {May},
  owner = {ple},
  timestamp = {2019.04.17}
}

@MISC{WikiSemaphore,
  author = {Unknown},
  title = {Chappe's semaphore},
  howpublished = {Wikimedia},
  year = {19th century},
  note = {License: Public Domain, Accessed: 2020-05-02},
  owner = {ple},
  timestamp = {2020.05.02},
  url = {https://en.wikipedia.org/wiki/File:Chappe_semaphore.jpg}
}