@phdthesis{Plessen1997,
  author      = {Hans-Gerrit Plessen},
  title       = {Analytik und Geochemie der Platingruppenelemente in magmatischen Gesteinen},
  type        = {doctoralthesis},
  pages       = {I, 135 S. : Ill., graph. Darst.},
  year        = {1997},
}