By Ssevviiri David   Groenewald Nico   in Communications in Algebra

ISSN:0092-7872|42|2|571-577

Taylor & Francis Ltd‎(2014)‎

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By Groenewald Nico J.   Ssevviiri David   in Communications in Algebra

ISSN:0092-7872|43|3|971-982

Taylor & Francis Ltd‎(2015)‎

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