@article{litvinchev2010lagrangian,
  title={Lagrangian heuristic for a class of the generalized assignment problems},
  author={Litvinchev, Igor and Mata, Miguel and Rangel, Socorro and Saucedo, Jania},
  journal={Computers \& Mathematics with Applications},
  volume={60},
  number={4},
  pages={1115--1123},
  year={2010},
  publisher={Elsevier},
  keywords = {pisis}
}

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