Auteur: Gebrenegus Ghilagaber

Hossein Riazoshams, Ph D, is a full-time Faculty member at the Department of Mathematics and Statistics, Lamerd Islamic Azad University of Iran; Stockholm University, Sweden; and University of Putra, Malaysia. Habshah Midi, Ph D, is Professor at the Department of Mathematics, Faculty of Science and Institute for Mathematical Research, University of Putra, Malaysia. Gebrenegus Ghilagaber, Ph D, is Professor and Head at the Department of Statistics, Stockholm University, Sweden.