On the Held-Karp relaxation for the asymmetric and symmetric traveling salesman problems

@article{Carr2004OnTH,
  title={On the Held-Karp relaxation for the asymmetric and symmetric traveling salesman problems},
  author={Robert D. Carr and Santosh Vempala},
  journal={Math. Program.},
  year={2004},
  volume={100},
  pages={569-587}
}