By Gobel M.   in Theoretical Computer Science

ISSN:0304-3975|225|1|177-184

Elsevier‎(1999)‎

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By Bundgen R.   Gobel M.   Kuchlin W.   in Journal of Symbolic Computation

ISSN:0747-7171|21|4|475-505

Academic Press‎(1996)‎

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