?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=G%C3%A9rard&rft.aulast=Lallement&rft.au=+Lallement+G%C3%A9rard&rft.atitle=A+generalization+of+the+Rees+theorem+in+semigroups&rft.date=1969&rft.issn=0001-6969&rft.title=Acta+scientiarum+mathematicarum&rft.issue=1-2&rft.volume=30&rft.pages=113-132&rft.genre=article