The Traveling Salesman Problem with Many Visits to Few Cities

@article{Cosmadakis1984TheTS,
  title={The Traveling Salesman Problem with Many Visits to Few Cities},
  author={Stavros S. Cosmadakis and Christos H. Papadimitriou},
  journal={SIAM J. Comput.},
  year={1984},
  volume={13},
  pages={99-108}
}