A Mathematical Theory of Communication
http://people.math.harvard.edu/~ctm/home/text/others/shannon/entropy/entropy.pdf
A Mathematical Theory of Communication - Wikipedia
https://en.wikipedia.org/wiki/A_Mathematical_Theory_of_Communication
Shannon–Weaver model - Wikipedia
https://en.wikipedia.org/wiki/Shannon%E2%80%93Weaver_model
The Mathematical Theory of Communication
https://pure.mpg.de/rest/items/item_2383164/component/file_2383163/content