@Article{fekete01tree,
  author  = {S{\'a}ndor P. Fekete and Jana Kremer},
  title   = {Tree spanners in planar graphs},
  journal = {Discrete Appl Math},
  year    = {2001},
  volume  = {108},
  number  = {1-2},
  pages   = {85--103},
}

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