Wolfram 2,3 Turing Machine Research Prize : What is a Turing Machine?

What is a Turing machine -- background information for the Wolfram 2,3 Turing machine research prize
Wolfram Science -- The Official Website of Stephen Wolfram's 'A New Kind of Science' book. Free online access to the complete book.

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Wolfram 2,3 Turing Machine Research Prize : Some Notable Universal

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Wolfram's 2-state 3-symbol Turing Machineの実装例（Python版

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Multiway Turing Machines—Wolfram Physics Bulletins

Wolfram 2,3 Turing Machine Research Prize: Technical Details

Wolfram's 2,3 Turing Machine Step-By-Step - Wolfram Demonstrations

Turing Machine -- from Wolfram MathWorld