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"On the Undecidability of the Freeness of Integer Matrix Semigroups."
David A. Klarner, Jean-Camille Birget, Wade Satterfield (1991)
- David A. Klarner, Jean-Camille Birget, Wade Satterfield:
On the Undecidability of the Freeness of Integer Matrix Semigroups. Int. J. Algebra Comput. 1(2): 223-226 (1991)
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