00729nam0-22002891i-450-990002570740403321000257074FED01000257074(Aleph)000257074FED0100025707420000920d1969----km-y0itay50------baENGSemigroupsKarl W. Folley.New YorkAcademic Press1969.xi, 277 p.24 cmInsiemiStrutture algebriche516Folley,Karl W.46867ITUNINARICAUNIMARCBK990002570740403321MXXV-A-951579MASMASSemigroups354097UNINAING01