@article{martignon-tpds15,
  author    = {A. Araldo and D. Rossi and F. Martignon},
  title     = {{Cost-aware caching: Caching more (costly items) for less (ISPs operational expenditures)}},
  journal   = {IEEE Transactions on Parallel and Distributed Systems},
  year      = {article in press, accepted for publication in May 2015},
  volume    = {},
  number    = {},
  pages     = {},
  month     = {},
  URL       = {}
}