@article{Laack2005,
  author    = {Laack, Walter van},
  title     = {Elektro- und Ultraschalltherapie},
  series = {Station{\"a}re Naturheilkunde : Handbuch f{\"u}r Klinik und Rehabilitation / Andr{\´e}-Michael Beer. [Autoren: Peter Altmeyer ...]},
  journal   = {Station{\"a}re Naturheilkunde : Handbuch f{\"u}r Klinik und Rehabilitation / Andr{\´e}-Michael Beer. [Autoren: Peter Altmeyer ...]},
  publisher = {Elsevier, Urban und Fischer},
  address   = {M{\"u}nchen},
  isbn      = {3-437-56890-6},
  pages     = {162 -- 171},
  year      = {2005},
  language  = {de}
}
@book{Laack2005,
  author    = {Laack, Walter van},
  title     = {Mit Logik die Welt begreifen},
  publisher = {van Laack},
  address   = {Aachen},
  isbn      = {978-3-936624-07-6},
  pages     = {380 S. : Ill., graph. Darst.},
  year      = {2005},
  language  = {de}
}