?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=+Sj%C3%B6lin+Per&rft.aulast=Sj%C3%B6lin&rft.aufirst=Per&rft.volume=75&rft.issn=0001-6969&rft.title=Acta+scientiarum+mathematicarum&rft.pages=233-239&rft.atitle=Some+remarks+on+Sobolev+regularity&rft.date=2009&rft.issue=1-2&rft.genre=article