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@ARTICLE{PfePisWoe97,
 author    = {U. Pferschy and D. Pisinger and G.J. Woeginger},
 title     = {Simple but efficient approaches for the collapsing knapsack problem},
 journal   = {Discrete Applied Mathematics},
 volume    = {77},
 pages     = {271--280},
 year      = {1997},
}