1. Faculty of Mathematics and Computer Science, Adam Mickiewicz University, Uniwersytetu Poznanskiego 4, 61-614 Poznan, Poland
2. Department of Mathematics, Faculty of Science, Dokuz Eylül University, 35390 İzmir, Türkiye
3. Department of Mathematics, Faculty of Science and Letters, Yaşar University, 35100 İzmir, Türkiye