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References to 'recursively enumerable'
1. automaton by CWoo
2. Chomsky hierarchy by CWoo
3. closure properties on languages by CWoo
4. formal definition of a Turing machine by CWoo
5. formal grammar by CWoo
6. Markov algorithm by CWoo
7. Post system by CWoo
8. primitive recursive function by CWoo
9. theory of formal languages by rspuzio
10. Turing machine by Henry