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Springer
doi.org/10.1007/s00224-014-9550-z
Theory of Computing Systems
Networks
Algorithms and Complexity

Buhrman, H., Loff Barreto, B. S., & Torenvliet, L. (2015). Hardness of Approximation for Knapsack Problems. Theory of Computing Systems, 56(2), 372–393. doi:10.1007/s00224-014-9550-z