@article{Visee98,
  author = {M. Visee and J. Teghem and M. Pirlot and E.L. Ulungu},
  title = {{Two-phases method and Branch and Bound procedures to solve the bi-objective Knapsack problem}},
  journal = {Journal of Global Optimization}, 
  volume = {12},
  number = {2},
  pages = {139--155},
  month = {March},
  year = {1998}
}

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