Lower bounds for the earliness--tardiness scheduling problem on parallel machines with distinct due dates. Kedad-Sidhoum, S., Solis, Y. R., & Sourd, F. European Journal of Operational Research, 189(3):1305--1316, North-Holland, 2008.
bibtex   
@article{kedad2008lower,
  title={Lower bounds for the earliness--tardiness scheduling problem on parallel machines with distinct due dates},
  author={Kedad-Sidhoum, Safia and Solis, Yasmin Rios and Sourd, Francis},
  journal={European Journal of Operational Research},
  volume={189},
  number={3},
  pages={1305--1316},
  year={2008},
  publisher={North-Holland},
  keywords = {pisis}
}

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