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 Gianni P.   Seppälä M.   Silhol R.   Trager B.   in Journal of Symbolic Computation

ISSN:0747-7171|26|6|789-803

Academic Press‎(1998)‎

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