@article{Laack1986,
  author    = {Laack, Walter van},
  title     = {Allgemeine physiotherapeutische Behandlung nach H{\"u}ft- und Kniegelenkoperationen},
  series = {Physiotherapie. 77 (1986), H. 2},
  journal   = {Physiotherapie. 77 (1986), H. 2},
  isbn      = {0031-9392},
  pages     = {68 -- 72},
  year      = {1986},
  language  = {de}
}
@book{Laack2003,
  author    = {Laack, Walter van},
  title     = {A better history of our world / Vol. 3. Death},
  publisher = {van Laack},
  address   = {Aachen},
  isbn      = {978-3-936624-01-4},
  pages     = {276 S.},
  year      = {2003},
  language  = {en}
}
@book{Laack2002,
  author    = {Laack, Walter van},
  title     = {A better history of our world / Vol. 2. Life},
  publisher = {van Laack},
  address   = {Aachen},
  isbn      = {978-3-8311-2597-5},
  pages     = {236 S.},
  year      = {2002},
  language  = {en}
}
@book{Laack2001,
  author    = {Laack, Walter van},
  title     = {A better history of our world / Vol. 1. The universe},
  publisher = {van Laack},
  address   = {Aachen},
  isbn      = {978-3-8311-1490-0},
  pages     = {188 S.},
  year      = {2001},
  language  = {en}
}