EfrosininB06'

@article{DBLP:journals/anor/EfrosininB06,
  author    = {Dimitri Efrosinin and
               Lothar Breuer},
  title     = {Threshold policies for controlled retrial queues with heterogeneous
               servers},
  journal   = {Annals OR},
  volume    = {141},
  number    = {1},
  year      = {2006},
  pages     = {139-162},
  ee        = {http://dx.doi.org/10.1007/s10479-006-5297-5},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}