A new Lagrangean relaxation approach for the hop-constrained minimum spanning tree problem

@article{Gouveia2001ANL,
  title={A new Lagrangean relaxation approach for the hop-constrained minimum spanning tree problem},
  author={Lu{\'i}s Gouveia and Cristina Requejo},
  journal={European Journal of Operational Research},
  year={2001},
  volume={132},
  pages={539-552}
}