01024nam a2200301 i 450099100130727970753620020507191048.0960923s1974 de ||| | eng 3540067302b10829404-39ule_instLE01310261ExLDip.to Matematicaeng512.4AMS 16D60Petrich, Mario58119Rings and semigroups /With an appendix by Richard WiegandtBerlin :Springer-Verlag,1974viii, 182 p. ;24 cmLecture notes in mathematics,0075-8434 ;380Bibliography: p. 168-174Associative ringsSemigroups.b1082940423-02-1728-06-02991001307279707536LE013 16D PET11 (1974)12013000060538le013-E0.00-l- 01010.i1093776628-06-02Rings and semigroups81377UNISALENTOle01301-01-96ma -engde 01