?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Cello%2C+Marco&rft.aufirst=Marco&rft.aulast=Cello&rft.title=A+Stochastic+Knapsack+Problem+with+Nonlinear+Capacity+Constraint&rft.date=2011&rft.genre=proceeding