@article{litvinchev2007refinement,
  title={Refinement of Lagrangian bounds in optimization problems},
  author={Litvinchev, Igor Semionovich},
  journal={Computational Mathematics and Mathematical Physics},
  volume={47},
  number={7},
  pages={1101--1107},
  year={2007},
  publisher={Springer},
  keywords = {pisis}
}

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