@article{DBLP:journals/talg/BecchettiKLP07,
  author    = {Luca Becchetti and
               Jochen K{\"o}nemann and
               Stefano Leonardi and
               Martin P{\'a}l},
  title     = {Sharing the cost more efficiently: Improved approximation
               for multicommodity rent-or-buy},
  journal   = {ACM Transactions on Algorithms},
  volume    = {3},
  number    = {2},
  year      = {2007},
  ee        = {http://doi.acm.org/10.1145/1240233.1240246},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}