?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Cremer&rft.aufirst=Helmuth&rft.issue=2&rft.volume=19&rft.date=March+2001&rft.atitle=Entry+and+Competition+in+the+Postal+Market%3A+Fondations+for+the+Construction+of+Entry+Scenarios&rft.title=Journal+of+Regulatory+Economics&rft.pages=107-121&rft.genre=article