- Author: Obádovics J. Gyula
- Language: Hungarian
- Year: 2005
- Author: Obádovics J. Gyula Szarka Zoltán
- Language: Hungarian
- Year: 2002
Matematika
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- Author: Obádovics J. Gyula
- Language: Hungarian
- Year: 1994
- Author: Obádovics J. Gyula - Dr. Szarka Zoltán
- Language: Hungarian
- Year: 2002
- Author: Obádovics J. Gyula
- Language: Hungarian
- Year: 2005
- Author: Obádovics J. Gyula
- Language: Hungarian
- Year: 2003