Institute of Informatics University of Warsaw, Poland.|Institute of Informatics University of Warsaw, Poland.|Institute of Informatics University of Warsaw, Poland.|Institute of Informatics University of Warsaw, Poland.|Institute of Informatics University of Warsaw, Poland.|Institute of Informatics University of Warsaw, Poland.|Institute of Informatics University of Warsaw, Poland.|Institute of Informatics University of Warsaw, Poland.|Institute of Informatics University of Warsaw, Poland.|Institute of Informatics University of Warsaw, Poland.