By Howlett R.B.   Rylands L.J.   Taylor D.E.   in Journal of Symbolic Computation

ISSN:0747-7171|31|4|429-445

Academic Press‎(2001)‎

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By Rylands L. J.   Coady C.   in International Journal of Mathematical Education in Science and Technology

ISSN:1464-5211|40|6|741-753

Taylor & Francis Ltd‎(2009)‎

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