By Song F.F.   Xu Y.   Qian Y.   in Theoretical Computer Science

ISSN:0304-3975|235|1|171-181

Elsevier‎(2000)‎

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By F. F. Xu   Y. Bando   Y. Ebina   T. Sasaki   in Philosophical Magazine Letters

ISSN:1362-3036|83|6|367-373

Taylor & Francis Ltd‎(2003)‎

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