4- Nesseqdec ddeqs n yedlisen deg tezrawt-nne, maca wiggad i ef nettkel ugar, wid i nefer i wakken ad nexdem tazrawt-nne, d A.AMZZIANE, 2008-2009 akked P.G.PERNET, 1998, M.MAMMERI, 2001, Y.NACI, 2012. M.A.SALHI, 2011.