AgraGR09'

@article{DBLP:journals/orl/AgraGR09,
  author    = {Agostinho Agra and
               Luis Gouveia and
               Cristina Requejo},
  title     = {Extended formulations for the cardinality constrained subtree
               of a tree problem},
  journal   = {Oper. Res. Lett.},
  volume    = {37},
  number    = {3},
  year      = {2009},
  pages     = {192-196},
  ee        = {http://dx.doi.org/10.1016/j.orl.2009.02.002},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}