@article{flores2015multi,
  title={The multi-vehicle cumulative covering tour problem},
  author={Flores-Garza, David A. and Salazar-Aguilar, M. Ang{\'e}lica and Ngueveu, Sandra Ulrich and Laporte, Gilbert},
  journal={Annals of Operations Research (DOI 10.1007/s10479-015-2062-7)},
  year={2015},
  publisher={Springer}
}

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