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+% This file was created with JabRef 2.7.1.
+% Encoding: UTF8
+
+@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}
+}
+