Hicham Beldjillali

Department of Applied Statistics, Ecole Nationale des Statistiques et Economie Appliquée. 11, chemin Doudou Mokhtar Benaknoun-Alger

Nacef Lamri

Department of Ecology and Environment, Faculty of Biological Sciences, University of Science and Technology, Houari Boumedienne, USTHB, BP 32 El Alia, Bab Ezzouar Algiers

Nour El Islam Bachari

Department of Ecology and Environment, Faculty of Biological Sciences, University of Science and Technology, Houari Boumedienne, USTHB, BP 32 El Alia, Bab Ezzouar Algiers