@book{Grap1993,
  author    = {Grap, Rolf Dietmar},
  title     = {Neue Formen der Arbeitsorganisation/1 (1993)},
  publisher = {Verl. der Augustinus-Buchh.},
  address   = {Aachen},
  isbn      = {3-86073-096-7},
  year      = {1993},
  language  = {de}
}
@book{Grap1993,
  author    = {Grap, Rolf Dietmar},
  title     = {Neue Formen der Arbeitsorganisation/2 (1993)},
  publisher = {Verl. der Augustinus-Buchh.},
  address   = {Aachen},
  isbn      = {3-86073-096-7},
  year      = {1993},
  language  = {de}
}