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* [http://dr-dau.net/index.shtml Dau, Frithjof]
* [http://dr-dau.net/index.shtml Dau, Frithjof]
** [http://dr-dau.net/eg_readings.shtml Peirce's Existential Graphs : Readings and Links]
** [http://dr-dau.net/eg_readings.shtml Peirce's Existential Graphs : Readings and Links]
** [http://dr-dau.net/pc.shtml Existential Graphs as Moving Pictures of Thought] — Computer Animated Proof of Leibniz's Praeclarum Theorema
** [http://dr-dau.net/pc.shtml Existential Graphs as Moving Pictures of Thought]
* [http://www.math.uic.edu/~kauffman/ Kauffman, Louis H.]
* [http://www.math.uic.edu/~kauffman/ Kauffman, Louis H.]