1. Fateme Kouchakinejad Department of Mathematics Graduate University of Advanced Technology Kerman, Iran (Islamic Republic of)
2. Department of Statistics Faculty of Mathematics and Computer Sciences Shahid Bahonar University of Kerman, Iran (Islamic Republic of)
3. Department of Mathematics and Descriptive Geometry Faculty of Civil Engineering Slovak University of Technology in Bratislava Radlinského 11 SK–810-05 Bratislava, Slovakia