@article{litvinchev2008comparison,
  title={Comparison of Lagrangian bounds for one class of generalized assignment problems},
  author={Litvinchev, Igor Semionovich and Rangel, Socorro},
  journal={Computational Mathematics and Mathematical Physics},
  volume={48},
  number={5},
  pages={739--746},
  year={2008},
  publisher={Springer},
  keywords = {pisis}
}

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