A Constant-Factor Approximation Algorithm for the Geometric k-MST Problem in the Plane. Mitchell, J. S. B., Blum, A., Chalasani, P., & Vempala, S. SIAM J. Comput., 28(3):771–781, 1998.
A Constant-Factor Approximation Algorithm for the Geometric k-MST Problem in the Plane [link]Paper  doi  bibtex   
@article{DBLP:journals/siamcomp/MitchellBCV98,
  author    = {Joseph S. B. Mitchell and
               Avrim Blum and
               Prasad Chalasani and
               Santosh Vempala},
  title     = {A Constant-Factor Approximation Algorithm for the Geometric k-MST
               Problem in the Plane},
  journal   = {{SIAM} J. Comput.},
  volume    = {28},
  number    = {3},
  pages     = {771--781},
  year      = {1998},
  url       = {https://doi.org/10.1137/S0097539796303299},
  doi       = {10.1137/S0097539796303299},
  timestamp = {Sat, 27 May 2017 01:00:00 +0200},
  biburl    = {https://dblp.org/rec/bib/journals/siamcomp/MitchellBCV98},
  bibsource = {dblp computer science bibliography, https://dblp.org}
}

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