By Blyth T. S.   Santos M. H. Almeida   in Communications in Algebra

ISSN:0092-7872|43|8|3294-3312

Taylor & Francis Ltd‎(2015)‎

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By Blyth T. S.   Santos M. H. Almeida   in Semigroup Forum

ISSN:0037-1912|69|2|230-242

Springer Publishing Company ‎(2004)‎

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By Blyth T.S.   Santos M.H. Almeida   in Semigroup Forum

ISSN:0037-1912|73|2|219-233

Springer Publishing Company ‎(2006)‎

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