?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.au=Stringari%2C+F.&rft.aulast=Stringari&rft.aufirst=F.&rft.date=2007&rft.title=Ant+Colony+Optimization+for+Sum+and+Difference+Pattern&rft.degree=Masters&rft.inst=University+of+Trento