By Fortuna E.   Gianni P.   Trager B.   in Journal of Symbolic Computation

ISSN:0747-7171|33|5|609-625

Academic Press‎(2002)‎

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By Fortuna E.   Gianni P.   Parenti P.   Traverso C.   in Journal of Symbolic Computation

ISSN:0747-7171|36|3|343-364

Elsevier‎(2003)‎

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