@phdthesis{gajardo2004accounting,
  author = {Gajardo, Jos{\'{e}} Luis Prieto},
  advisor = {Dressler, Falko and Niedermayer, Heiko},
  title = {{Accounting and Charging in 3G Networks: Comparative Analysis of the System Architecture}},
  institution = {Wilhelm-Schickard-Institute for Computer Science},
  year = {2004},
  month = {May},
  location = {Tuebingen},
  school = {University of Tuebingen},
  type = {Final Thesis}
}