https://www.startimes.com/?t=16557025
http://dspace.univ-tebessa.dz:8080/xmlui/bitstream/handle/123456789/7402/%D9%85%D8%B0%D9%83%D8%B1%D8%A9%20%D8%A7%D9%84%D8%AA%D8%AE%D8%B1%D8%AC.pdf?sequence=1&isAllowed=y
https://drive.google.com/file/d/1uXqy1EzagBWCNe5ibXekyi4cAYOsKNgS/view
http://dspace.univ-djelfa.dz:8080/xmlui/bitstream/handle/123456789/2160/%D8%AF%D8%B9%D9%88%D9%89%20%D8%A7%D9%84%D8%AA%D8%B9%D9%88%D9%8A%D8%B6%20%D9%81%D9%8A%20%D8%A7%D9%84%D9%82%D8%A7%D9%86%D9%88%D9%86%20%D8%A7%D9%84%D8%A5%D8%AF%D8%A7%D8%B1%D9%8A%20%D8%A7%D9%84%D8%AC%D8%B2%D8%A7%D8%A6%D8%B1%D9%8A.pdf?sequence=1&isAllowed=y