A two-commodity flow formulation for the traveling salesman and the makespan problems with time windows

@article{Langevin1993ATF,
  title={A two-commodity flow formulation for the traveling salesman and the makespan problems with time windows},
  author={Andr{\'e} Langevin and Martin Desrochers and Jacques Desrosiers and Sylvie G{\'e}linas and François Soumis},
  journal={Networks},
  year={1993},
  volume={23},
  pages={631-640}
}