@book{Grueters1987,
  author    = {Gr{\"u}ters, Hugo},
  title     = {Aufgabensammlung Mechanik / von Hugo Gr{\"u}ters},
  publisher = {Becker-Kuns},
  address   = {Aachen},
  pages     = {Getr. Z{\"a}hlung : graph. Darst.},
  year      = {1987},
  language  = {de}
}
@book{Laack2022,
  author    = {Laack, Walter van},
  title     = {Aufruf zum Nachdenken: Corona und neue Kriege - Wie kann die Menschheit {\"u}berleben?},
  publisher = {van Laack GmbH},
  address   = {Aachen},
  isbn      = {978-3-936624-56-4},
  pages     = {56 Seiten},
  year      = {2022},
  language  = {de}
}
@book{Stulpe1986,
  author    = {Stulpe, Werner},
  title     = {Bedingte Erwartungen und stochastische Prozesse in der generalisierten Wahrscheinlichkeitstheorie : Beschreibung sukzessiver Messungen mit zuf{\"a}lligem Ausgang},
  address   = {Berlin},
  pages     = {199 S.},
  year      = {1986},
  language  = {de}
}
@book{Dikta1987,
  author    = {Dikta, Gerhard},
  title     = {Beitr{\"a}ge zur nichtparametrischen Sch{\"a}tzung der Regressionsfunktion},
  pages     = {81 S.},
  year      = {1987},
  language  = {de}
}
@book{Grueters1971,
  author    = {Gr{\"u}ters, Hugo},
  title     = {Berechnung des Spannungszustandes in homogenen anisotropen Scheiben mit Hilfe einer Integralgleichungsmethode},
  year      = {1971},
  language  = {de}
}
@book{Grotendorst2003,
  author    = {Grotendorst, Johannes},
  title     = {ComputerMathematik mit Maple},
  publisher = {Forschungszentrum J{\"u}lich},
  address   = {J{\"u}lich},
  isbn      = {3-89336-325-4},
  pages     = {VI, 274 S. : Ill., graph. Darst.},
  year      = {2003},
  language  = {de}
}
@book{Grotendorst2003,
  author    = {Grotendorst, Johannes},
  title     = {ComputerMathematik mit Maple / 2. Aufl.},
  publisher = {Forschungszentrum J{\"u}lich},
  address   = {J{\"u}lich},
  isbn      = {3-89336-354-8},
  pages     = {VI, 293 S. : graph. Darst. + 1 CD-ROM},
  year      = {2003},
  language  = {de}
}
@book{Laack1999,
  author    = {Laack, Walter van},
  title     = {Der Schl{\"u}ssel zur Ewigkeit},
  publisher = {van Laack},
  address   = {Aachen},
  isbn      = {978-3-9805239-4-3},
  pages     = {285 S.},
  year      = {1999},
  language  = {de}
}
@book{Laack2000,
  author    = {Laack, Walter van},
  title     = {Eine bessere Geschichte unserer Welt / Bd. 1. Das Universum},
  publisher = {van Laack},
  address   = {Aachen},
  isbn      = {978-3-8311-0345-4},
  pages     = {196 S.},
  year      = {2000},
  language  = {de}
}
@book{Laack2001,
  author    = {Laack, Walter van},
  title     = {Eine bessere Geschichte unserer Welt / Bd. 2. Das Leben},
  publisher = {van Laack},
  address   = {Aachen},
  isbn      = {978-3-8311-2114-4},
  pages     = {248 S.},
  year      = {2001},
  language  = {de}
}