A Sharp Bound on the Ratio Between Optimal Integer and Fractional Covers

@article{Balas1984ASB,
  title={A Sharp Bound on the Ratio Between Optimal Integer and Fractional Covers},
  author={Egon Balas},
  journal={Math. Oper. Res.},
  year={1984},
  volume={9},
  pages={1-5}
}