@phdthesis{Billinger2007,
  author      = {Kai Billinger},
  title       = {HELEX Septal Occluder for transcatheter closure of patent foramen ovale : multicenter experience},
  type        = {doctoralthesis},
  pages       = {31},
  school      = {Universit{\"a}tsbibliothek Johann Christian Senckenberg},
  year        = {2007},
}