
- Author: Ortner Helmut
- Language: German
- Year: 2017

- Author: Ortner Helmut
- Language: German
- Year: 2017

- Author: Ortner Helmut
- Language: German
- Year: 2016

- Author: Joachim Schäfer, Ortner Helmut
- Language: German
- Year: 2016

- Author: Benjamin Ross, Ortner Helmut
- Language: English
- Year: 2016