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"Poly-APX- and PTAS-Completeness in Standard and Differential Approximation."
Cristina Bazgan, Bruno Escoffier, Vangelis Th. Paschos (2004)
- Cristina Bazgan, Bruno Escoffier, Vangelis Th. Paschos:
Poly-APX- and PTAS-Completeness in Standard and Differential Approximation. ISAAC 2004: 124-136
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