?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=Luigi&rft.au=Laura%2C+Luigi&rft.aulast=Laura&rft.title=Multi-layer+model+for+the+web+graph&rft.date=7+May+2002&rft.genre=proceeding