| Serhii Bardyla, University of Vienna, Austria |
| Zoltán Boros, University of Debrecen, Hungary |
| Ferdinand Čapka, Institute of Slovak Academy of Sciences, Bratislava, Slovakia |
| Peter Eliaš, Mathematical Institute, Slovak Academy of Sciences, Košice, Slovakia |
| Dimitrios Georgiou, Department of Mathematics, University of Patras, Patras, Greece |
| Ľubica Holá, Mathematical Institute, Slovak Academy of Sciences, Bratislava, Slovakia |
| Dušan Holý, Department of Mathematics and Computer Science, Faculty of Education, Trnava University, Slovakia |
| Grażyna Horbaczewska, University of Lodz, Łódź, Poland |
| Ljubiša Kočinac, Faculty of Sciences and Mathematics, University of Niš, Serbia |
| Stanisław Kowalczyk, Pomeranian University in Słupsk, Poland |
| Sebastian Lindner, University of Lodz, Łódź, Poland |
| Adam Marton, Technical University of Košice, Košice, Slovakia |
| Milan Matejdes, Department of Mathematics and Computer Science, Faculty of Education, Trnava University in Trnava, Slovak Republic |
| Branislav Novotný, Mathematical Institute, Slovac Academy of Sciences, Bratislava, Slovakia |
| Emilia Przemska, Pomeranian University in Slupsk, Poland |
| Péter Tóth, University of Debrecen, Hungary |
| Małgorzata Turowska, Pomeranian University in Słupsk, Poland |
| Renata Wiertelak, University of Lodz, Łódź, Poland |
