1. Department of Applied Statistics, Johannes Kepler Universitat Linz, Linz, Austria
2. Institute of Statistics, Universidad de Valparaiso, Valparaiso, Chile
3. Institute of Mathematics, Faculty of Science, P.J. Safarik University in Kosice, Kosice, Slovakia
4. Department of Applied Mathematics and Statistics, Comenius University, Bratislava, Slovakia
5. Faculty of Mathematics and Informatics, Shumen University, Shumen, Bulgaria