?url_ver=Z39.88-2004&rft_id=10.1007%2Fs00165-012-0233-8&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=Alberto&rft.au=Pettorossi%2C+Alberto&rft.aulast=Pettorossi&rft.pages=569-594&rft.issn=0934-5043&rft.atitle=Constraint-based+correctness+proofs+for+logic+program+transformations&rft.title=Formal+Aspects+of+Computing&rft.issue=4-6&rft.volume=24&rft.date=2012&rft.genre=article