By Ciaurri Óscar   Navas Luis M.   Ruiz Francisco J.   Varona Juan L.   in American Mathematical Monthly

ISSN:1930-0972|122|5|444-451

Mathematical Association of America‎(2015)‎

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By Betancor Jorge J.   Ciaurri Oscar   Martinez Teresa   Perez Mario   Torrea Jose L.   Varona Juan L.   in Semigroup Forum

ISSN:0037-1912|73|1|129-142

Springer Publishing Company ‎(2006)‎

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