@phdthesis{Hartung2008,
  author      = {Rupert Hartung},
  title       = {Computational problems of quadratic forms : complexity and cryptographic perspectives},
  type        = {doctoralthesis},
  pages       = {183},
  school      = {Universit{\"a}tsbibliothek Johann Christian Senckenberg},
  year        = {2008},
}