@article{coin-hammainen-2007,
  author = {Renjish Kumar and Heikki H{\"a}mm{\"a}inen},
  title = {Competition in International Mobile Roaming: Alternative Clusters},
  journal = {COMMUNICATIONS & STRATEGIES},
  volume = {3rd Quarter 2007},
  number = {67},
  pages = {151-172},
  year = {2007},
  url = {},
}