The unbounded knapsack problem: given a knapsack of some capacity and a set of items that have a weight and a value, determine the maximum value of items you can place in your knapsack. The number ...

Gang Yu, On the Max-Min 0-1 Knapsack Problem with Robust Optimization Applications, Operations Research, Vol. 44, No. 2 (Mar. - Apr., 1996), pp. 407-415. Free online reading for over 10 million ...