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"On the Undecidability of Freeness of Matrix Semigroups."
Julien Cassaigne, Tero Harju, Juhani Karhumäki (1999)
- Julien Cassaigne, Tero Harju, Juhani Karhumäki:
On the Undecidability of Freeness of Matrix Semigroups. Int. J. Algebra Comput. 9(3-4): 295-306 (1999)
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