@phdthesis{rosenstiel2004pgpfone,
  author = {Rosenstiel, Alexander},
  advisor = {Niedermayer, Heiko and Dressler, Falko},
  title = {{PGPfone - vertrauliche Gespr{\"{a}}che {\"{u}}ber das Netz}},
  institution = {Wilhelm-Schickard-Institute for Computer Science},
  year = {2004},
  month = {April},
  location = {Tuebingen},
  school = {University of Tuebingen},
  type = {Pre-Master's Thesis (Studienarbeit)}
}