@book{Gebhardt2003,
  author    = {Gebhardt, Andreas},
  title     = {Rapid Prototyping},
  publisher = {Hanser},
  address   = {Munich [u.a.]},
  isbn      = {3-446-21259-0},
  pages     = {XV, 379 S. : Ill., graph. Darst.},
  year      = {2003},
  language  = {en}
}
@book{Gebhardt2000,
  author    = {Gebhardt, Andreas},
  title     = {Rapid prototyping : Werkzeug f{\"u}r die schnelle Produktentstehung. - 2., v{\"o}llig {\"u}berarb. Aufl.},
  publisher = {Hanser},
  address   = {M{\"u}nchen [u.a.]},
  isbn      = {3-446-21242-6},
  pages     = {XVII, 409 S. : Ill., graph. Darst.},
  year      = {2000},
  language  = {en}
}