?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=http%3A%2F%2Feprints.imtlucca.it%2F137%2F&rft.title=Constraints+for+Service+Contracts&rft.creator=Buscemi%2C+Maria+Grazia&rft.creator=Coppo%2C+Mario&rft.creator=Dezani-Ciancaglini%2C+Mariangiola&rft.creator=Montanari%2C+Ugo&rft.subject=QA75+Electronic+computers.+Computer+science&rft.date=2011&rft.type=Working+Paper&rft.type=NonPeerReviewed&rft.identifier=++Buscemi%2C+Maria+Grazia+and+Coppo%2C+Mario+and+Dezani-Ciancaglini%2C+Mariangiola+and+Montanari%2C+Ugo++Constraints+for+Service+Contracts.++Working+Paper++%23+%2F2011++++++++(Submitted)+++