@book{Harder1990,
  author    = {Harder, J{\"o}rn},
  title     = {Zur Messung von Werkstoffparametern im Torsionsschwingversuch},
  address   = {Braunschweig},
  pages     = {90 S.},
  year      = {1990},
  language  = {de}
}
@book{Harder1997,
  author    = {Harder, J{\"o}rn},
  title     = {Simulation lokaler Fließvorg{\"a}nge in Polykristallen},
  publisher = {Mechanik-Zentrum der Technischen Universit{\"a}t},
  address   = {Braunschweig},
  isbn      = {3-920395-27-1},
  pages     = {181 S : Ill., graph. Darst.},
  year      = {1997},
  language  = {de}
}