?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Osorio&rft.aufirst=M&rft.au=Osorio%2C+M&rft.date=October+2002&rft.atitle=A+logical+approach+to+A-Prolog&rft.volume=67&rft.issn=1571-0661&rft.pages=284+-+295&rft.title=Electronic+Notes+in+Theoretical+Computer+Science&rft.genre=article