@misc{momi-verkasalo,
  type = {PhD Thesis},
  author = {Hannu Verkasalo},
  title = {Handset-Based Analysis of Mobile Service Usage},
  year = {2009},
  url = {http://lib.tkk.fi/Diss/2009/isbn9789512298440/},
  school = {Department of Communications and Networking, TKK Helsinki University of Technology},
}