?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=R&rft.au=Hirsch%2C+R&rft.aulast=Hirsch&rft.pages=1211-1244&rft.title=The+Journal+of+Symbolic+Logic&rft.issn=0022-4812&rft.atitle=Some+Undecidable+Problems+on+Representability+as+Binary+Relations&rft.issue=4&rft.date=2012&rft.volume=77&rft.genre=article