Wolfram has put the entire text of Cellular Automata and Complexity: Collected Papers online http://www.stephenwolfram.com/publications/cellular-automata-compl

Wolfram has put the entire text of Cellular Automata and Complexity: Collected Papers online http://www.stephenwolfram.com/publications/cellular-automata-complexity/ http://www.stephenwolfram.com/publications/cellular-automata... The survey papers in this collection would be the place for OP to start; note that some of the other papers assume a significant background in mathematics and physics.