?url_ver=Z39.88-2004&rft_id=10.1007%2FBFb0055623&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=Rocco&rft.au=De+Nicola%2C+Rocco&rft.aulast=De+Nicola&rft.date=1998&rft.isbn=3-540-64896-8&rft.title=Possible+Worlds+for+Process+Algebras&rft.btitle=CONCUR+'98+Concurrency+Theory&rft.genre=bookitem