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@MISC{Penubag2012,
  author = {"Penubag" and Victor Blacus},
  title = {Electromagnetic spectrum},
  year = {2012},
  note = {License: \href{https://creativecommons.org/licenses/by-sa/3.0/deed.en}{CC-BY-SA
	3.0}},
  owner = {ple},
  timestamp = {2020.05.03},
  url = {https://en.wikipedia.org/wiki/File:Electromagnetic-Spectrum.svg}
}

@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{Inductiveload2007,
  author = {Inductiveload},
  title = {A diagram of the Milton spectrum, showing the type, wavelength (with
	examples), frequency, the black body emission temperature.},
  howpublished = {Wikimedia},
  year = {2007},
  note = {License: \href{https://creativecommons.org/licenses/by-sa/3.0/deed.en}{CC-BY-SA
	3.0}},
  owner = {ple},
  timestamp = {2020.05.03},
  url = {https://en.wikipedia.org/wiki/File:EM_Spectrum_Properties_edit.svg}
}

@BOOK{Shannon1949,
  title = {The Mathematical Theory of Communication},
  publisher = {University of Illinois Press},
  year = {1949},
  author = {Claude E. Shannon and Warren Weaver},
  note = {ISBN 978-0-252-72548-7},
  owner = {ple},
  timestamp = {2020.05.03}
}

@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}
}