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E. L. Post, Finite combinatory processes???formulation, The Journal of Symbolic Logic, vol.1, issue.03, pp.103-105, 1936.
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E. L. Post, Formal Reductions of the General Combinatorial Decision Problem, American Journal of Mathematics, vol.65, issue.2, pp.197-215, 1943.
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E. L. Post, Recursively enumerable sets of positive integers and their decision problems, pp.284-316, 1944.

E. L. Post, Absolutely unsolvable problems and relatively undecidable propositions -Account of an anticipation, pp.340-433, 1965.

J. A. Robinson, A machine-oriented logic based on the resolution principle, Communications of the ACM, vol.5, pp.23-41, 1965.

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