@inproceedings{coin-hammainen-verkasalo-kivi-2006,
  title = {Usage Patterns of Mobile Subscribers: Regulatory Observations in Finland},
  author = {Heikki H{\"a}mm{\"a}inen and Hannu Verkasalo and Antero Kivi},
  booktitle = {16th Biennial ITS Conference, 12-16 June, 2006, Beijing, China},
  year = {2006},
  month = {Jun.},
  url = {http://www.netlab.tkk.fi/%7Ehverkasa/hammainen_its_2006.pdf},
}