Institution: | 1. Faculty of Mathematics, Computer Science and Econometrics, University of Zielona Góra, Zielona Góra, Poland.D.Glazowska@wmie.uz.zgora.pl;3. Faculty of Mathematics, Computer Science and Econometrics, University of Zielona Góra, Zielona Góra, Poland.;4. Institute of Mathematics and Informatics, John Paul II Catholic University of Lublin, Lublin, Poland. |