http://www.google.co.ma/search?hl=fr&q=%D9%85%D8%A4%D8%B3%D8%B3%D8%A7%D8%AA+%D8%AA%D8%B9%D9%84%D9%8A%D9%85%D9%8A%D8%A9+%D9%85%D8%B1%D8%AA%D8%A8%D8%B7%D8%A9+%D8%A8%D8%A7%D9%84%D8%A7%D9%86%D8%AA%D8%B1%D9%86%D9%8A%D8%AA&meta=
http://bchakib.over-blog.fr/article-10091938.html
http://www.uaemath.com/ar/aforum/showthread.php?=&threadid=4758
http://www.mathyards.com/
mardi 17 avril 2007
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