The previous page is sending you to http://dspace.univ-biskra.dz:8080/jspui/bitstream/123456789/4237/1/133-%D8%A7%D9%84%D8%B3%D9%86%D9%8A%D8%A9-%D8%A5%D8%AC%D8%B1%D8%A7%D8%A1%D8%A7%D8%AA%20%D9%85%D8%AD%D8%A7%D9%83%D9%85%D8%A9%20%D8%A7%D9%84%D8%A3%D8%AD%D8%AF%D8%A7%D8%AB%20%D9%81%D9%8A%20%D8%A7%D9%84%D8%AA%D8%B4%D8%B1%D9%8A%D8%B9%20%D8%A7%D9%84%D8%AC%D8%B2%D8%A7%D8%A6%D8%B1%D9%8A.PDF.

 If you do not want to visit that page, you can return to the previous page.