http://www.google.co.ma/search?hl=fr&q=%D8%AA%D8%B9%D8%B1%D9%8A%D9%81+%D8%A7%D9%84%D9%86%D8%B4%D8%B1+%D9%88%D8%A7%D9%84%D8%AA%D8%B9%D9%85%D9%8A%D9%84&meta=
http://kamal0912.tripod.com/region.htm
http://membres.lycos.fr/web22/index-6.htm
http://www.e-monsite.com/mansourdahbiksar/rubrique-1011640.html
http://www.google.co.ma/search?q=%D8%AF%D8%B1%D9%88%D8%B3%2B%D9%88%D8%B1%D8%B2%D8%A7%D8%B2%D8%A7%D8%AA&hl=fr&start=10&sa=N
http://marabe7.com/go2site.php?id=7404
http://www.khayma.com/hanifi/math.htm
http://almaghrib.canalblog.com/archives/_____________________/index.html
http://www.eshraaaf.tabukgedu.gov.sa/vb/showthread.php?s=628dd3d5cbf4c86fd204d3e3f58a22a4&t=142
http://www.eshraaaf.tabukgedu.gov.sa/vb/showthread.php?s=628dd3d5cbf4c86fd204d3e3f58a22a4&t=142