@article{coin-verkasalo-hammainen-2007,
  author = {Hannu Verkasalo and Heikki H{\"a}mm{\"a}inen},
  title = {A Handset-Based Platform for Measuring Mobile Service Usage},
  journal = {INFO: The Journal of Policy, Regulation, and Strategy},
  volume = {9},
  number = {1},
  pages = {},
  month = {Jan.},
  year = {2007},
  url = {},
}