@article{litvinchev2011milp,
  title={A milp bi-objective model for static portfolio selection of R\&D projects with synergies},
  author={Litvinchev, I and L{\'o}pez, F and Escalante, HJ and Mata, M},
  journal={Journal of Computer and Systems Sciences International},
  volume={50},
  number={6},
  pages={942--952},
  year={2011},
  publisher={SP MAIK Nauka/Interperiodica},
  keywords = {pisis}
}

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