@book{CormenLRS01,
  author = {T. H. Cormen and C. E. Leiserson and R. L. Rivest and C. Stein},
  publisher = {MIT Press},
  title = {Introduction to Algorithms},
  year = {2001}
}

@inproceedings{Karger93,
  author    = {David R. Karger},
  title     = {Global Min-cuts in RNC, and Other Ramifications of a Simple
               Min-Cut Algorithm},
  booktitle = {ACM-SIAM Symposium on Discrete Algorithms},
  year      = {1993},
  pages     = {21-30}
}

@article{KleinR95,
  author    = {Philip N. Klein and
               R. Ravi},
  title     = {A Nearly Best-Possible Approximation Algorithm for Node-Weighted
               Steiner Trees},
  journal   = {J. Algorithms},
  volume    = {19},
  number    = {1},
  year      = {1995},
  pages     = {104-115}
}