Biography - Biography of René Thom. www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Thom.html
Catastrophe Theory - Rene Thom and Catastrophe Theory. www.exploratorium.edu/complexity/CompLexicon/catastrophe.html
Phase Transition - The edge of chaos seems to be the phase transition state of the system or the place where choices are made and take place. www.wfu.edu/~petrejh4/PhaseTransition.htm
Types of Causation - Peter Hammer: Dynamics and Types of Causation. www.hum.au.dk/semiotics/docs/epub/WS2k/Ham/Cause.html
