Some Examples of Difficult Traveling Salesman Problems

@article{Papadimitriou1978SomeEO,
  title={Some Examples of Difficult Traveling Salesman Problems},
  author={Christos H. Papadimitriou and Kenneth Steiglitz},
  journal={Operations Research},
  year={1978},
  volume={26},
  pages={434-443}
}
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