?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=Valerio&rft.aulast=Senni&rft.au=Senni%2C+Valerio&rft.title=Folding+Transformation+Rules+for+Constraint+Logic+Programs&rft.date=2008&rft.genre=proceeding