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| Institute of Informatics |
| Faculty of Automatic Control, Electronics and Computer Science |
| Silesian University of Technology |
| ul. Akademicka 16, Gliwice, Poland |
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| Andrzej Polanski |
| e-mail: andrzej.polanski@polsl.pl |
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| Rafal Pokrzywa |
| e-mail: rafal.pokrzywa@polsl.pl |
| |
