@phdthesis{Szpak2006,
  author      = {Nikodem Szpak},
  title       = {Spontaneous particle creation in time-dependent overcritical fields of QED},
  type        = {doctoralthesis},
  school      = {Universit{\"a}tsbibliothek Johann Christian Senckenberg},
  year        = {2006},
}