@phdthesis{Keilbach2000,
  author      = {Rupert Keilbach},
  title       = {Minimalfl{\"a}chen und Bj{\"o}rlingsches Problem in der Relativgeometrie},
  type        = {doctoralthesis},
  school      = {Universit{\"a}t W{\"u}rzburg},
  year        = {2000},
}