Hans Kellerer Ulrich Pferschy Improved Dynamic Programming in Connection with an FPTAS for the Knapsack Problem. 5-11 2004 8 J. Comb. Optim. 1 http://dx.doi.org/10.1023/B:JOCO.0000021934.29833.6b db/journals/jco/jco8.html#KellererP04