@book{Mueller2013,
  author    = {M{\"u}ller, Thomas},
  title     = {K{\"o}rperschaftsteuergesetz / Unter Mitarb. von ... Thomas M{\"u}ller ...},
  editor    = {M{\"o}ssner, Manfred},
  publisher = {NWB Verl.},
  address   = {Herne},
  isbn      = {978-3-482-64311-8},
  pages     = {XXIV, 2048 S.},
  year      = {2013},
  language  = {de}
}
@book{Weissmantel2013,
  author    = {Weißmantel, Ralf},
  title     = {Plakatzeichen : Plakate mit Schrift {\"u}ber Schrift ; 50 typografische Plakate ; Kommunikationsdesign},
  publisher = {Fachhochschule Aachen, Fachbereich Design},
  address   = {Aachen},
  isbn      = {978-3-00041325-4},
  pages     = {51 S. : {\"u}berw. Ill.},
  year      = {2013},
  language  = {de}
}
@book{Hoever2013,
  author    = {Hoever, Georg},
  title     = {Arbeitsbuch h{\"o}here Mathematik : Aufgaben mit vollst{\"a}ndig durchgerechneten L{\"o}sungen},
  publisher = {Springer},
  address   = {Berlin},
  isbn      = {978-3-642-30336-4},
  pages     = {XII, 524 S.},
  year      = {2013},
  language  = {de}
}
@book{Hoever2013,
  author    = {Hoever, Georg},
  title     = {H{\"o}here Mathematik kompakt},
  publisher = {Springer},
  address   = {Berlin},
  isbn      = {978-3-642-30334-0},
  pages     = {X, 245 S.},
  year      = {2013},
  language  = {de}
}