@book{LiebersBreuer2002,
  author    = {Liebers, Klaus and Breuer, Elmar},
  title     = {Physik plus : mit f{\"a}cher{\"u}bergreifenden Themen und Projektangeboten ; Kl. 9/10, [Hauptbd.], Gymnasium Th{\"u}ringen},
  editor    = {Mikelskis, Helmut and Wilke, Hans-Joachim},
  publisher = {Cornelsen},
  address   = {Berlin},
  isbn      = {3-06-020983-9},
  pages     = {192 S.},
  year      = {2002},
  language  = {de}
}
@book{Liebers2002,
  author    = {Liebers, Klaus},
  title     = {Physik plus : Kl. 9, Arbeitsh., Gymnasium Th{\"u}ringen},
  editor    = {Mikelskis, Helmut and Wilke, Hans-Joachim},
  publisher = {Cornelsen},
  address   = {Berlin},
  isbn      = {3-06-020984-7},
  pages     = {48 S.},
  year      = {2002},
  language  = {de}
}
@book{Liebers2002,
  author    = {Liebers, Klaus},
  title     = {Physik : Kl. 9/10, Lehrerbd., Mittelschule Sachsen},
  editor    = {Mikelskis, Helmut and Wilke, Hans-Joachim},
  publisher = {Volk und Wissen},
  address   = {Berlin},
  isbn      = {3-06-022234-7},
  pages     = {64 S.},
  year      = {2002},
  language  = {de}
}
@book{DietrichLiebersBergstedt1998,
  author    = {Dietrich, Volkmar and Liebers, Klaus and Bergstedt, Christel},
  title     = {Naturwissenschaften : Biologie, Chemie, Physik : Bd. 3 Boden},
  editor    = {Dietrich, Volkmar},
  publisher = {Volk-und-Wissen-Verl.},
  address   = {Berlin},
  isbn      = {3-464-85176-1},
  pages     = {64 S.},
  year      = {1998},
  language  = {de}
}
@book{DietrichLiebers1998,
  author    = {Dietrich, Volkmar and Liebers, Klaus},
  title     = {Naturwissenschaften : Biologie, Chemie, Physik : Bd. 1 Farben},
  editor    = {Dietrich, Volkmar and Bergstedt, Christel and Liebers, Klaus},
  publisher = {Volk-und-Wissen-Verl.},
  address   = {Berlin},
  isbn      = {3-06-030966-3},
  pages     = {64 S.},
  year      = {1998},
  language  = {de}
}
@book{Liebers1995,
  author    = {Liebers, Klaus},
  title     = {Optische Ger{\"a}te},
  series = {Naturwissenschaften : Biologie, Chemie, Physik},
  journal   = {Naturwissenschaften : Biologie, Chemie, Physik},
  publisher = {Volk und Wissen},
  address   = {Berlin},
  pages     = {80 S.},
  year      = {1995},
  language  = {de}
}
@book{DietrichLiebers1997,
  author    = {Dietrich, Volkmar and Liebers, Klaus},
  title     = {Naturwissenschaften : Biologie, Chemie, Physik : Bd. 5 Vom Fliegen},
  editor    = {Dietrich, Volkmar and Bergstedt, Christel and Liebers, Klaus},
  publisher = {Volk-und-Wissen-Verl.},
  address   = {Berlin},
  isbn      = {3-06-020930-8},
  pages     = {64 S.},
  year      = {1997},
  language  = {de}
}
@article{NoeskeLiebers1995,
  author    = {N{\"o}ske, Robert and Liebers, Klaus},
  title     = {Projekte und Kurse zu optischen Ger{\"a}ten : Faszination Glas (1)},
  year      = {1995},
  language  = {de}
}
@article{NoeskeLiebers1995,
  author    = {N{\"o}ske, Robert and Liebers, Klaus},
  title     = {Projekte und Kurse zu optischen Ger{\"a}ten : Faszination Glas (2)},
  year      = {1995},
  language  = {de}
}
@book{Liebers2001,
  author    = {Liebers, Klaus},
  title     = {Physik : Kl. 7, [Hauptbd.], Regelschule Th{\"u}ringen},
  editor    = {Mikelskis, Helmut and Wilke, Hans-Joachim},
  publisher = {Cornelsen},
  address   = {Berlin},
  isbn      = {3-06-020736-4},
  pages     = {128 S.},
  year      = {2001},
  language  = {de}
}